Bewitched - Season 7 Episode 27
Laugh, Clown, Laugh

Endora claims that Darrin has no sense of humor, so she puts a spell on him, turning him into a comedian. His client, Mr. Jameson, does not like Darrins new Def Comedy Jam phase when he gets a migrane headache. Darrin discovers that Endora has hexed him, and she gives him another spell- this time, making jokes of anything sad or discouraging. The Jamesons come by and at th very mention of Jamisons wifes bursitis, Darrin starts laughing. Thinking that Darrins insensitivity will cost Larry and him the account, the Jamesons think otherwise and give McMann and Tate the account.