Quora上关于TBBT中，Sheldon的精彩片段的一些回答。

ans①：
He calls some professor at his university stupid, and when asked to apologise to the man by his mother, he says, " I called you stupid. And I'm sorry for pointing it out"

ans②：
Penny: So what do you say, Sheldon — are we your X-Men?
Sheldon: No, the X-Men were named for the “X” in “Charles Xavier.” Since I am Sheldon Cooper, you will be my “C-Men.”

ans③：
Sheldon: Why are you crying?
Penny: Because I am stupid.
Sheldon: That's no reason to cry. One cries because one is sad. For example, I cry because others are stupid, and that makes me sad.

ans：
''A neutron walks into a bar and asks how much for a drink. The bartender replies, ‘For you, no charge.’”