One of my favorite sketches, and a popular comedy formula, is to put someone with a mental handicap in some kind of unlikely situation. For example: The retarded gynecologist, the retarded Jesus, the retarded Osama Bin Laden. It works. It's funny. Inappropriate? I dunno. I feel like I'm a pretty good judge of what crosses the line of good taste being that I am retarded. Socially perhaps, but severly retarded.