Comedian Greg Giraldo called in to tell Howard a story involving Gilbert.
Greg said that he recently performed at a club a week after Gilbert had been there and that he learned that one of the club's cooks rubbed the steak Gilbert had ordered for dinner on his bare buttocks and package (prior to cooking it) as payback for Gilbert's refusal to tip.
Gilbert noted that his steak seemed extra tangy that night, but that he didn't think anything of it. Howard and Greg both noticed that Gilbert seemed unfazed by the news, which neither could understand.
Artie pointed out that so many cooks probably have it out for Gilbert that this kind of thing happens all the time, which would explain Gilbert's reaction to the story.