The Big Bang Theory: 10 Moments When Sheldon Cooper Was Wrong

5. An Incorrect Board?

Episode: The Hamburger Postulate Leslie Winkle is perhaps the only character capable of putting Sheldon completely in his place (apart from his mother, of course). And this Big Bang Theory moment might have been the one to start their entire feud. Sheldon wakes up after a night on the sofa to notice the equations on his board have been tampered with. He is momentarily pacified when Leonard points out that it fixes the problem he's been having, but when Leslie enters and reveals she changed the equation during the night, Sheldon is horrified. Upset, he protests, 'I don't come into your house and touch your board,' to which Leslie responds, 'there are no incorrect equations on my board.' Ouch...