Ordered Chinese the other day and had it delivered because I was too lazy to pick it up. The order was around $40. As the guy showed up, I realized I had not had anything delivered to the house in a while (since I usually go and get it) and was wondering what was a fair tip. Is it 10% of the tab or just a few bucks. I don't think I can honestly give a pizza guy $2 for a $20 pizza who may have come across town when I tip the bartender a buck for twisting off the top to my beer.