According to Jim: Season 2, Episode 21
Bo Diddley (1 Apr. 2003)
TV Episode | TV-PG | | Comedy
Cheryl needs a root canal, but she does not want to have it done. Jim says he will go with Cheryl so she will have support. However, at the dentist office, Jim realizes that Bo Diddley is in the building and he wants to leave Cheryl.