Bazinga! It's the catchphrase that fans of 'The Big Bang Theory' can't get enough of! Jim Parsons, who plays Sheldon on the show, just sat down with AOL.com and revealed where the famed 'B' word started. He also talked about his new role in the dramatic new film about the HIV and AIDS crisis in the 1980s called 'The Normal Heart' on HBO May 25th. The star revealed why the message of the film still resonates today.