Ok, so I tend bar at a pretty decent restaurant here in Raleigh. I have served quite a few professional athletes. The Carolina hurricanes are pretty much regulars during the season. Dre Bly, Az Hakim, Tory Holt, even met and chatted with Johnny White (remember him?) for a while, while he ate his delicious bacon burger and fries. Mario Williams has been in dozens of times. Bought him a Mai Tai last time and had him autograph two Bills hats, that I just so happened to have in my truck. Even random whackos like Ludacris. Point is some tip great and some not at all. Some lady left me a 20, because my Cosmo "changed her life". But credit card information should be discretionary and that girl will most likely be fired. My friend posted his $700 from Peyton and Eli Manning to his facebook page and got fired for that! As far as the whole etiquette thing goes, the guys put together to go orders are running around like hamsters all night. And they don't expect, but really appreciate a tip from the guest ordering take out. I'm an over tipper. I tip everyone, from the guy that rolls my sushi at Kanki, to the kid that cleans out my golf cart. But that's just me. But my drinks are always strong and my sushi rolls always comes out before everyone else's... And yes, I have tipped at McDonald's before.