The Cornhusker Vortex

Summary
Sheldon, who grew up in Texas where it was popular, teaches Leonard how to understand football so that he can try to fit in with Penny's friends. During the game Leonard attempts to demonstrate what he has learned, but his explanations are too clinical, and he fails to fit in. Meanwhile, Raj loses his kite to Sheldon in a kite fighting contest because Howard abandons him at a critical moment to chase a girl. Howard makes it up to him by spending a Saturday afternoon with Raj at the La Brea Tar Pits.

The title refers to the Football Team (Nebraska Cornhuskers) Penny and her friends watch and the fact that Leonard gets caught up in trying to understand the sport of football to fit in with Penny's friends.

This episode featured Sheldon making "cylon" toast, using a Battlestar Galactica themed toaster.