This is a great episode. I am a big Will Friedle fan; so I always like the episodes in which Eric has a large part.
The crossover with Singled Out is great. Chris Hardwick and Eric's interactions are great.
The secondary plotline is funny also. The whole "Belive It or Don't" fantasy sequence is totally bizarre, but it is also a great parody of Unsolved Mysteries type shows. Shawn is particularly funny with his whole doctor masquerade. This is by far one of the weirdest episodes of this season, but it is also one of the funnies, and one of my personal favorites.