'Big Bang Theory' cast shares their favorite moments as they say goodbye to iconic series (Exclusive)

The Big Bang Theory's final episode is almost here. 

The iconic CBS comedy will come to a close on May 16, and while the cast isn't spilling details on how the series is wrapping up, they've put quite a bit of thought into how they'll say goodbye. 

"There's no manual," Johnny Galecki told ET's Nischelle Turner during our 16th set visit over the course of Big Bang's 12 seasons. "It's a very, very unique experience that we've all shared." 

"So many people are a part of it too," Kaley Cuoco added. "There's so many different people and families and work-related and our families. It just goes so deep and so many people are connected to this show and so many fans. It's created its own little world."

For Melissa Rauch, it's not the people she'll miss, because she fully intends on remaining friends with all of them. "I know we're all bonded here together for life. It's not so much, 'I'm never going to see these people again,'" she shared. "I think it's about missing the people in these circumstances, like huddling together before we go out for intros or laughing together in between scenes. That's what I'm sad about the most." 

Our favorite characters have been through a lot over the course of the show, from weddings to babies to just learning how to talk to the opposite sex. 

"When I spoke to Penny for the first time...  Well, permanently when my character started talking to women, that was pretty cool," Kunal Nayyar joked. "That was big for me." 

"Proposing to Bernadette would be a big one for me. Although he messed it up," Simon Helberg said. "I think, if I remember, he proposed right away, I believe, and she said, 'What are you doing?'"

"Oh gosh! What defines you in the last 12 years? It's not easy to answer," Cuoco confessed. "That is hard to answer because that's what I loved about the show... The relationships have been natural. It's all felt all realistic, even [Penny and Leonard's] relationship, how it's been on and off at times. It's felt really realistic to me."

The actress -- who had yet to read the final script at the time of ET's set visit -- was hoping the show's last episode would feature a big elevator moment. Nayaar and Helberg, meanwhile, offered their hilarious advice for fans who might not be happy with Big Bang's ending. 

"Blame the writers! Really, we have nothing to do [with it]. We just show up and say the lines," Nayaar cracked. 

"If it's great, we'll take credit. If it's bad, we will blame the writers," Helberg quipped. "I don't even know what it is yet, so in truth, we will blame or celebrate the writers depending on what they come up with. But [finales] are hard." 

"I think only one character dies in the finale, yes?" Nayaar joked. 

"We go straight up to heaven [in the elevator]," Helberg added. 

The Big Bang Theory's finale airs May 16 at 8 p.m. ET/PT on CBS, and Thursday's episode of ET -- featuring tons of exclusive content -- will be broadcast from the set of the sitcom. See more on the series in the video below. 

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The "Big Bang Theory" cast steps out for the series finale party
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The "Big Bang Theory" cast steps out for the series finale party
PASADENA, CALIFORNIA - MAY 01: Kaley Cuoco attends the Series Finale Party for CBS' "The Big Bang Theory" at The Langham Huntington, Pasadena on May 01, 2019 in Pasadena, California. (Photo by Alberto E. Rodriguez/Getty Images)
PASADENA, CALIFORNIA - MAY 01: Johnny Galecki attends the Series Finale Party for CBS' "The Big Bang Theory" at The Langham Huntington, Pasadena on May 01, 2019 in Pasadena, California. (Photo by Alberto E. Rodriguez/Getty Images)
PASADENA, CALIFORNIA - MAY 01: Jim Parsons attends the Series Finale Party For CBS' "The Big Bang Theory" at The Langham Huntington, Pasadena on May 01, 2019 in Pasadena, California. (Photo by Alberto E. Rodriguez/Getty Images)
PASADENA, CALIFORNIA - MAY 01: Karl Cook and Kaley Cuoco attend the Series Finale Party for CBS' "The Big Bang Theory" at The Langham Huntington, Pasadena on May 01, 2019 in Pasadena, California. (Photo by Alberto E. Rodriguez/Getty Images)
PASADENA, CALIFORNIA - MAY 01: Kunal Nayyar attends the Series Finale Party for CBS' "The Big Bang Theory" at The Langham Huntington, Pasadena on May 01, 2019 in Pasadena, California. (Photo by Alberto E. Rodriguez/Getty Images)
PASADENA, CALIFORNIA - MAY 01: Johnny Galecki (R) attends the Series Finale Party for CBS' "The Big Bang Theory" at The Langham Huntington, Pasadena on May 01, 2019 in Pasadena, California. (Photo by Alberto E. Rodriguez/Getty Images)
PASADENA, CALIFORNIA - MAY 01: Mayim Bialik attends the Series Finale Party for CBS' "The Big Bang Theory" at The Langham Huntington, Pasadena on May 01, 2019 in Pasadena, California. (Photo by Alberto E. Rodriguez/Getty Images)
PASADENA, CALIFORNIA - MAY 01: Melissa Rauch attends the Series Finale Party for CBS' "The Big Bang Theory" at The Langham Huntington, Pasadena on May 01, 2019 in Pasadena, California. (Photo by Alberto E. Rodriguez/Getty Images)
PASADENA, CALIFORNIA - MAY 01: Kunal Nayyar attends the Series Finale Party for CBS' "The Big Bang Theory" at The Langham Huntington, Pasadena on May 01, 2019 in Pasadena, California. (Photo by Alberto E. Rodriguez/Getty Images)
PASADENA, CALIFORNIA - MAY 01: Sarah Gilbert attends the Series Finale Party For CBS' "The Big Bang Theory" at The Langham Huntington, Pasadena on May 01, 2019 in Pasadena, California. (Photo by Alberto E. Rodriguez/Getty Images)
PASADENA, CALIFORNIA - MAY 01: Jocelyn Towne and Simon Helberg attend the Series Finale Party For CBS' "The Big Bang Theory" at The Langham Huntington, Pasadena on May 01, 2019 in Pasadena, California. (Photo by Alberto E. Rodriguez/Getty Images)
PASADENA, CALIFORNIA - MAY 01: Anne Prince and Wil Wheaton attend the Series Finale Party For CBS' "The Big Bang Theory" at The Langham Huntington, Pasadena on May 01, 2019 in Pasadena, California. (Photo by Alberto E. Rodriguez/Getty Images)
PASADENA, CALIFORNIA - MAY 01: John Stankey, Chuck Lorre, Kaley Cuoco and Peter Roth attend the Series Finale Party For CBS' "The Big Bang Theory" at The Langham Huntington, Pasadena on May 01, 2019 in Pasadena, California. (Photo by Alberto E. Rodriguez/Getty Images)
PASADENA, CALIFORNIA - MAY 01: Chuck Lorre and Kaley Cuoco attend the Series Finale Party for CBS' "The Big Bang Theory" at The Langham Huntington, Pasadena on May 01, 2019 in Pasadena, California. (Photo by Alberto E. Rodriguez/Getty Images)
PASADENA, CALIFORNIA - MAY 01: Kevin Sussman and Whitney Rice attend Series Finale Party For CBS' "The Big Bang Theory" - Arrivals at The Langham Huntington, Pasadena on May 01, 2019 in Pasadena, California. (Photo by Presley Ann/FilmMagic)
PASADENA, CALIFORNIA - MAY 01: Casey Sander attends Series Finale Party For CBS' "The Big Bang Theory" - Arrivals at The Langham Huntington, Pasadena on May 01, 2019 in Pasadena, California. (Photo by Presley Ann/FilmMagic)
PASADENA, CALIFORNIA - MAY 01: Chuck Lorre and Arielle Lorre attend the Series Finale Party For CBS' "The Big Bang Theory" at The Langham Huntington, Pasadena on May 01, 2019 in Pasadena, California. (Photo by Alberto E. Rodriguez/Getty Images)
PASADENA, CALIFORNIA - MAY 01: Anne Prince and Wil Wheaton attend the Series Finale Party For CBS' "The Big Bang Theory" at The Langham Huntington, Pasadena on May 01, 2019 in Pasadena, California. (Photo by Alberto E. Rodriguez/Getty Images)
PASADENA, CALIFORNIA - MAY 01: David Theune attends the Series Finale Party For CBS' "The Big Bang Theory" at The Langham Huntington, Pasadena on May 01, 2019 in Pasadena, California. (Photo by Alberto E. Rodriguez/Getty Images)
PASADENA, CALIFORNIA - MAY 01: Courtney Henggeler attends the Series Finale Party For CBS' "The Big Bang Theory" at The Langham Huntington, Pasadena on May 01, 2019 in Pasadena, California. (Photo by Alberto E. Rodriguez/Getty Images)
PASADENA, CALIFORNIA - MAY 01: Kate Miccuci attends the Series Finale Party For CBS' "The Big Bang Theory" at The Langham Huntington, Pasadena on May 01, 2019 in Pasadena, California. (Photo by Alberto E. Rodriguez/Getty Images)
PASADENA, CALIFORNIA - MAY 01: June Squibb attends the Series Finale Party For CBS' "The Big Bang Theory" at The Langham Huntington, Pasadena on May 01, 2019 in Pasadena, California. (Photo by Alberto E. Rodriguez/Getty Images)
PASADENA, CALIFORNIA - MAY 01: Kevin Sussman (L) attends the Series Finale Party For CBS' "The Big Bang Theory" at The Langham Huntington, Pasadena on May 01, 2019 in Pasadena, California. (Photo by Alberto E. Rodriguez/Getty Images)
PASADENA, CALIFORNIA - MAY 01: Laura Spencer attends the Series Finale Party For CBS' "The Big Bang Theory" at The Langham Huntington, Pasadena on May 01, 2019 in Pasadena, California. (Photo by Alberto E. Rodriguez/Getty Images)
PASADENA, CALIFORNIA - MAY 01: Steve Holland and Steve Molaro attend the Series Finale Party For CBS' "The Big Bang Theory" at The Langham Huntington, Pasadena on May 01, 2019 in Pasadena, California. (Photo by Alberto E. Rodriguez/Getty Images)
PASADENA, CALIFORNIA - MAY 01: Levar Burton attends the Series Finale Party For CBS' "The Big Bang Theory" at The Langham Huntington, Pasadena on May 01, 2019 in Pasadena, California. (Photo by Alberto E. Rodriguez/Getty Images)
PASADENA, CALIFORNIA - MAY 01: Keith Carradine attends the Series Finale Party For CBS' "The Big Bang Theory" at The Langham Huntington, Pasadena on May 01, 2019 in Pasadena, California. (Photo by Alberto E. Rodriguez/Getty Images)
PASADENA, CALIFORNIA - MAY 01: Andrea Roth and Peter Roth attend the Series Finale Party For CBS' "The Big Bang Theory" at The Langham Huntington, Pasadena on May 01, 2019 in Pasadena, California. (Photo by Alberto E. Rodriguez/Getty Images)
PASADENA, CALIFORNIA - MAY 01: Bob Newhart attends the Series Finale Party for CBS' "The Big Bang Theory" at The Langham Huntington, Pasadena on May 01, 2019 in Pasadena, California. (Photo by Alberto E. Rodriguez/Getty Images)
PASADENA, CALIFORNIA - MAY 01: Rati Gupta attends the Series Finale Party For CBS' "The Big Bang Theory" at The Langham Huntington, Pasadena on May 01, 2019 in Pasadena, California. (Photo by Alberto E. Rodriguez/Getty Images)
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