BOOOOOOOOOO Batle of the sexes was always lame to me.
My station did a show-case-showdown style game for prizes sometimes, always went great.
*EDIT*
OOOOOOOOOO Almost forgot about this one, a lady in Canada (Jane Hurle) does a Christmas feature called Reindeer Races where I think you have 2 callers bet on what reindeer will win