Koothrappali is living in a fantasy world. It's bad because he's dancing there with his best friend's gal.

The Big Bang Theory Season 4 Episode 14 Quotes

Leonard: How do you get an entire lecture hall to flip you off at the same time?
Howard: Apparently if you're Sheldon all you have to do is turn your back.

I was expecting applause but I suppose stunned silence is equally appropriate.