The conflict begins when Howard finds an unopened in Sheldon’s desk drawer.
Sheldon was driving Penny to the hospital (from a previous episode) in her car. [S3E16] The Excelsior Acquisition
Penny takes Sheldon to Stan Lee's house to apologize for him missing the signing. Sheldon misinterprets Stan Lee's sarcastic invitation to "come in and watch the game" and enters the house. The conflict begins when Howard finds an unopened
"The Big Bang Theory" The Excelsior Acquisition (TV ... - IMDb [S3E16] The Excelsior Acquisition