I'm in the pizza business...

If I see "Grape Soda" on the tag I just assume no tip.

Racist? Perhaps. True 99% of the time? Yep.

EDIT: Hey guys. Just got off work. No grape soda in this order but suffice to say it was 7 african americans in a 2 bed motel room who were a total pain in the ass on the phone. No tip on a $40 something order.