Dax Shepard says he was once threatened by Mike Tyson at an NBA All-Star Game


Dax Shepard almost got knocked out by a former heavyweight boxer!

The CHIPS star was recently a guest on Watch What Happens Live With Andy Cohen, where he was asked to reveal the meanest thing a celebrity has ever said to him.

WATCH: Kristen Bell Interviews Dax Shepard Who Gushes Over Her: 'You Are on a Cellular Level Likeable'

Shepard, 42, explained that it all went down at an NBA All-Star Game. He was joking around with Tyson when all of a sudden, the 50-year-old athlete allegedly said, "If you don't take your hand off my shoulder, I'm gonna break your f***ing head open."

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NEW YORK, NY - MARCH 22: Actors Dax Shepard and Kristen Bell visit the SiriusXM Studios on March 22, 2017 in New York City. (Photo by Cindy Ord/Getty Images)
HOLLYWOOD, CA - MARCH 20: Dax Shepard and Kristen Bell arrive at the Los Angeles Premiere 'CHiPS' at TCL Chinese Theatre on March 20, 2017 in Hollywood, California. (Photo by Jon Kopaloff/FilmMagic)
HOLLYWOOD, CA - MARCH 20: Dax Shepard and Kristen Bell fool around at the premiere of Warner Bros. Pictures' 'CHiPS' at TCL Chinese Theatre on March 20, 2017 in Hollywood, California. (Photo by Todd Williamson/Getty Images)
LOS ANGELES, CA - JANUARY 18: (L-R) Actors Matt LeBlanc, Kevin Hart, Kristen Bell, and Dax Shepard backstage at the People's Choice Awards 2017 at Microsoft Theater on January 18, 2017 in Los Angeles, California. (Photo by Kevin Mazur/WireImage)
BEVERLY HILLS, CA - JANUARY 08: Actors Dax Shepard and Kristen Bell attend the 74th Annual Golden Globe Awards at The Beverly Hilton Hotel on January 8, 2017 in Beverly Hills, California. (Photo by Frazer Harrison/Getty Images)
Kristen Bell and Dax Shepard attend the fifth annual Baby2Baby gala honoring Jennifer Garner at 3Labs in Culver City, on November 12, 2016. / AFP / CHRIS DELMAS (Photo credit should read CHRIS DELMAS/AFP/Getty Images)
HOLLYWOOD, CALIFORNIA - APRIL 10: Dax Shepard and Kristen Bell wear Game of Thrones Shirts at Tattoos on a date night at the premiere of HBO's 'Game Of Thrones' Season 6 at TCL Chinese Theatre on April 10, 2016 in Hollywood, California. (Photo by Todd Williamson/Getty Images)
WESTWOOD, CALIFORNIA - MARCH 28: Actors Kristen Bell and Dax Shepard arrive at the premiere of USA Pictures' 'The Boss' at Regency Village Theatre on March 28, 2016 in Westwood, California. (Photo by Gregg DeGuire/WireImage)
BEVERLY HILLS, CA - FEBRUARY 22: Actor Dax Shepard and actress Kristen Bell arrive at the 2015 Vanity Fair Oscar Party Hosted By Graydon Carter at Wallis Annenberg Center for the Performing Arts on February 22, 2015 in Beverly Hills, California. (Photo by Jon Kopaloff/FilmMagic)
BEVERLY HILLS, CA - FEBRUARY 22: Actors Dax Shepard (L) and Kristen Bell arrive at the 2015 Vanity Fair Oscar Party Hosted By Graydon Carter at Wallis Annenberg Center for the Performing Arts on February 22, 2015 in Beverly Hills, California. (Photo by Axelle/Bauer-Griffin/FilmMagic)
SANTA MONICA, CA - FEBRUARY 21: Actors Dax Shepard and Kristen Bell arrive at the 2015 Film Independent Spirit Awards on February 21, 2015 in Santa Monica, California. (Photo by Axelle/Bauer-Griffin/FilmMagic)
SANTA MONICA, CA - FEBRUARY 21: Actor Dax Shepard and wife actress Kristen Bell arrive at the 2015 Film Independent Spirit Awards on February 21, 2015 in Santa Monica, California. (Photo by Jon Kopaloff/FilmMagic)
LOS ANGELES, CA - JANUARY 07: Actor Dax Shepard and wife actress Kristen Bell arrive at The 41st Annual People's Choice Awards at Nokia Theatre L.A. Live on January 7, 2015 in Los Angeles, California. (Photo by Jon Kopaloff/FilmMagic)
LOS ANGELES, CA - JANUARY 07: (L-R) Actress Kristen Bell, actor Dax Shepard and actress Monica Potter attend The 41st Annual People's Choice Awards at Nokia Theatre LA Live on January 7, 2015 in Los Angeles, California. (Photo by Frazer Harrison/Getty Images for The People's Choice Awards)
BEVERLY HILLS, CA - OCTOBER 01: Actors Dax Shepard and Kristen Bell arrive at the Los Angeles Premiere of 'The Judge' at AMPAS Samuel Goldwyn Theater on October 1, 2014 in Beverly Hills, California. (Photo by Axelle/Bauer-Griffin/FilmMagic)
Actors Dax Shepard and Kristen Bell arrive at the premiere of 'This Is Where I Leave You' held at TCL Chinese Theater in Hollywood. (Photo by Frank Trapper/Corbis via Getty Images)
TORONTO, ON - SEPTEMBER 04: Actors Dax Shepard (L) and Kristen Bell attend 'The Judge' premiere during the 2014 Toronto International Film Festival at Roy Thomson Hall on September 4, 2014 in Toronto, Canada. (Photo by Jason Merritt/Getty Images)
TORONTO, ON - SEPTEMBER 04: Actors Kristen Bell (L) and Dax Shepard attend 'The Judge' premiere during the 2014 Toronto International Film Festival at Roy Thomson Hall on September 4, 2014 in Toronto, Canada. (Photo by George Pimentel/WireImage)
NASHVILLE, TN - JUNE 04: Dax Shepard and Kristen Bell attend the 2014 CMT Music awards at the Bridgestone Arena on June 4, 2014 in Nashville, Tennessee. (Photo by Jeff Kravitz/FilmMagic)
WASHINGTON, DC - MAY 03: Actor Dax Shepard and Kristen Bell attend the 100th Annual White House Correspondents' Association Dinner at the Washington Hilton on May 3, 2014 in Washington, DC. (Photo by Kris Connor/FilmMagic)
WASHINGTON, DC - MAY 03: (L-R) Nick Loeb, Sofia Vergara, Jesse Tyler Ferguson, Dax Shepard, Kristen Bell and Justin Mikita attend the Bloomberg & Vanity Fair cocktail reception following the 2014 WHCA Dinner at Villa Firenze on May 3, 2014 in Washington, DC. (Photo by Dimitrios Kambouris/VF14/WireImage)
LOS ANGELES, CA - APRIL 05: Actor Dax Shepard (L) and actress Kristen Bell attend the 2nd Light Up The Blues Concert - An Evening Of Music To Benefit Autism Speaks at The Theatre At Ace Hotel on April 5, 2014 in Los Angeles, California. (Photo by Imeh Akpanudosen/Getty Images for LUTB)
WEST HOLLYWOOD, CA - MARCH 02: Actors/husband & wife Dax Shepard (L) and Kristen Bell attend the 2014 Vanity Fair Oscar Party hosted by Graydon Carter on March 2, 2014 in West Hollywood, California. (Photo by David Livingston/Getty Images)
WEST HOLLYWOOD, CA - MARCH 02: (EXCLUSIVE ACCESS, SPECIAL RATES APPLY) (L-R) Actors Megan Mullally, Nick Offerman, Kristen Bell, and Dax Shepard attend the 2014 Vanity Fair Oscar Party Hosted By Graydon Carter on March 2, 2014 in West Hollywood, California. (Photo by Jeff Vespa/VF14/WireImage)
HOLLYWOOD, CA - MARCH 2: Dax Shepard (L) and Kristen Bell arrive at the 86th Annual Academy Awards at Hollywood & Highland Center on March 2, 2014 in Los Angeles, California. (Photo by Dan MacMedan/WireImage)
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"I had met [Tyson] the week before and he really liked me, and then I was way too familiar with him, I was grabbing his shoulder and stuff, and then he didn't remember me and then he understandably told me to get my hand off of him," Shepard continued. "And then I thought he was joking and then he escalated it and then I took my hand off his shoulder."

Perhaps that's karma for blackmailing his wife, Kristen Bell?

More on that -- and their ongoing feud over home décor -- below!

WATCH: Kristen Bell and Dax Shepard Adorably Spar Over Home Décor on Instagram

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