Amy: Is something bothering you?
Sheldon: Howard dressed up as me and imitated me, and everyone laughed.
Amy: Oh. Well, that must have felt terrible.
Sheldon: It did. I never realized my friends viewed me as an object of ridicule.
Amy: Oh, I don't think that's true.
Sheldon: They laughed, Amy. In a derisive way. Not in the instructive way I laugh at them when they're being stupid.