A really good episode. The humor was really good, and there was good timing for all of the jokes, and it got deep (not really :P) deep into some of the show's characters.
Eric and Donna, after an argument, make a bet, and don't have sex with each other. While doing so, both of them go absolutely insane. Kelso is totally convinced that he has photogrpaphed a U.F.O (Unidentified Flying Object), and he will not listen to what any one of his friends in the gang says about the matter. Meanwhile, Red decides that he will throw a party to make friends.
A perfect episode. One of the really strong episodes in the show.
I call it a: