Dancing is boring as hell. I can get the same health benefits from a good run and not be as bored. I have rhythm, but jerking body limbs around aimlessly seems pretty foolish and narcissistic (when done publicly).
As much as I love most board/dice/card games, I find CCGs (collectible card games) incredibly dumb. This includes MTG, Yugioh, etc. Not necessarily because of the game mechanics, but because of the "collectible" side of it. What this means is when you buy a pack, you have no idea what you are getting, and may get nothing you want. What a damn waste. Also, you get the concept of "rares" introduced, which can be obtained for a small fortune by those with plenty of money to blow, giving them a potential significant advantage you may have no access to. LCGs are a far superior format if you want to play a similar type of game. Always know exactly what you are getting, no match skewing rares, etc.
Dorks. And as dorky as cosplay can be, the amount of work that goes into making the costumes, etc. is pretty amazing. 
