Johnny Galecki contemplates a difficult question here. The actor was a popular presence at Comic-Con.
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Johnny Galecki may play a nerd on the show Two and a Half Men, but the actor is anything but.
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TBBT Quotes

Penny: What actor holds the record for being named People magazine's Sexiest Man Alive?
Sheldon: William Shatner!
Leonard: I don't think it's Shatner.
Sheldon: Then it's got to be Patrick Stewart

Penny: Hey, Sheldon, did you change your Wi-Fi password again?
Sheldon: Yes, it's "Penny, get your own Wi-Fi." No spaces.