A high fiber breakfast cereal.
Season 1, Episode 2 - The Big Bran Hypothesis
Aired October 1, 2007
Leonard hopes to make a good impression with Penny by volunteering to sign for a package of hers. When Leonard and Sheldon move the package to her apartment, Sheldon is disturbed by her apparent lack of tidiness. Sheldon's inappropriate mission to tidy Penny's apartment lands him and Leonard in hot water with her.