.... a drink. I'm a blue belt and when I'm done with BJJ training I head to the pub for a pint. I usually don't even bother to invite the health nuts in the gym.
But the other day I invited a brown belt and he came along.
Damn, the next time I went, all the higher belts who usually don't even talk to me (unless it's to ask if I'm okay when they wreck a body part of mine) asked if they could come to the pub with me too. Buying people stuff really gets you to respect you deserve.
(I think I've been spending too much time on this site.)