I've never tried the milk thing, I don't like milk to begin with, but I lost the saltine bet, I finished about 10 secs. late.
Here is a bet I've heard attempted, 10 McDonalds Cheeseburgers, 5 min. drink if you want, the most I heard was 8. no puking, for an hour after, the ususal. it was amusing,
another was an eggroll head to head contest, they stopped at 30 something