Leonard: Sheldon, what do you think you're doing?
Sheldon: My room is paid up until the end of the month, so I can do with it whatever I please, which includes renting it out for a dollar a night.
Theodore: It's like the '40s again.

Sheldon: If it's like your 3-D chess game, then you're out of your length, width and depth. Amy, get the Neosporin, somebody just got burned.

Leonard: Sheldon, I know what you did, now change the password back.
Sheldon: Well, powder me in sugar and call me a donut, if it isn't Leonard Hofstadter.

Sheldon: It's not my fault I'm bad at sharing; I skipped kindergarten.