Back in the day when I.T. was booming, my little group of drunken co-conspirators and I would go to sports bars, 10-12 of us, ask for our own waitress... We'd all throw in 100 at the beginning, and explain "that pile is your tip, if you suck, it'll be used to pay for drinks to help us forget shitty service." Waitresses would normally make 90% of it... When they saw the pile shrink, they understood we meant lots of money (1000+) for lots of service. All above the board, we were mostly married and didn't shit where we ate. They did have to deal with a bunch of tech. gurus getting absolutely piss drunk and closing out the place on a Tuesday night... We called it giving back for making lots of money to play with computers.