The Vengeance Formulation - S3-E9
Corrected entry: Sheldon caused thousands of dollars of damage to university property when he exacted his revenge against Barry Kripke in an act of blatant vandalism. Not only does he get Barry, but also the university president and other dignitaries. Sheldon would have certainly faced a disciplinary hearing, along with paying for the damages he admitted to causing. But nothing of the event is mentioned after that.
Correction: Nothing about it is mentioned in the show. Doesn't mean that he wasn't punished. He's lucky he held his job, probably. That's all we know.
lionhead