Christopher "Mr. Belvedere" Hewett supposedly sat on his own testicles during a script reading for the show. The rumor has two endings...that he yelled so loudly that the light above the table in the room shook or that he was carried out on a stretcher.
Actor Christopher Hewett, who played Mr. Belvedere on the eponymous comedy show, once sat on his testicles at a staged script reading and yelled so loudly from the pain that the flourescent lighting shook.