In a new video for Glamour.com, the stars of the series get candid during a red carpet quiz while celebrating the 200th episode party at Vibiana in Los Angeles.
A few highlights: Johnny Galecki, 40, is "least nervous and most comfortable half-naked" when playing Leonard, and Jim Parsons, 42, wishes his character Sheldon would have a "secret one-night stand" with Penny (Kaley Cuoco) because the "after-coitus conversation would be so enjoyable to play."
Meanwhile, Cuoco, 30, chose 93-year-old comic book writer Stan Lee as Penny's dream hook-up: "He's hot, you guys!"
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As for which actor is most like his or her character, that was an easy guess – it's real-life scientist Mayim Bialik because she "most literally understands what the hell we're talking about," Parsons said.
Bialik, 40, agreed: "Probably me, not just because I'm a scientist, but I'm kind of fastidious and nerdy and geeky."
But even after nine and a half years filming the hit series together, there's still one thing the tight-knit cast can't do: spell costar Kunal Nayyar's character's last name, "Koothrappali." (Hey, we don't blame them.)
The Big Bang Theory airs Thursdays (8 p.m. ET) on CBS.