Depends, a lot of people just round up the bill. If it's $22, a lot of people will give you $25 and you keep the change, for example. Now on the weekends, you can make a lot. I live in a military town, and young soldiers party more than college kids, and they tip great. Get 10 guys ordering pizzas and they all throw in a couple of bucks for the tip and it adds up fast. Best single tip I can remember was $30 for 5 pizzas.

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For a people who are free, and who mean to remain so, a well-organized and armed militia is their best security.
Thomas Jefferson