Everyone tells me I need to gain some weight, so I always get paid back in candies. And I go, "Hey, can you help me get fat by paying me back in candies?"

This really works.

Or, if it's more than 10 bucks, I usually go, "Hey, let's go to dinner and hang out... oh yeah, maybe you can cover me for the dinner? I wanna get fat."

This works also.

I think getting paid back in anything edible in fact would work really well... because you feel like you aren't stripping your friends of money, but rather food (?) lol