Every Inside Joke on The Big Bang Theory, Alphabetized.

“Smart? I’d Have To Lose 60 IQ Points To Be Classified As Smart!”
Our old friend Dr. Sheldon Cooper is a lot of things (a lot), but modest certainly isn’t one of them. Simply knowing he’s a genius isn’t enough. He wants everyone to know he’s more of a genius than his genius friends, and he often goes to great lengths to prove it.
When he’s belittled by Leonard’s latest girlfriend, fellow scientist Lesley Winkle, he declares her his arch-enemy and refuses to stay in the apartment while she’s there. Out on the stairs with his laptop, he meets Penny and announces (in true Sheldon style) that he preferred her relationship with Leonard so she should get right back to it. Penny starts to explain that somebody as smart as Sheldon must understand that feelings don’t work that way, before he takes offense at the word ‘smart’ and brushes her off.