I've never worked in the food service industry my sister used to work at red lobster and she always tipped out the bartenders and cooks. but thanks for assuming...
5$ to the pizza man
10% for mediocre service
15% for great service (constantly refilling, small chat, friendly yet not invasive, moderately happy)
20% for great service at mid-high end restaurants
25% if I'm in New York or a more Northern State and I was PERFECTLY satisfied with everything from food to service (I add this in because I've done it twice.)
If I go to like a place where my meal is Under $5. I normally give like 100% tip o.o
Especially if the girl is hot. If its like $10-$20, I normally tip $3-$5.
i usually tip, but on the occasion that i don't, it's only due to bad service or a switch in servers... you can't expect me to tip when you've only been with us for like 5 min...