I enjoyed reading all the posts. It depends actually, but the most important thing is that the tip is heartily given.
Pizza guy meaning the guy driving to your house? Dude, that guy is using his own car, gas and he works for less than Min. wage... $5 + at least..you tip 20% at a restaurant and that guy doesn't drive to your house....
I tip 15% -- perhaps higher or lower depending on the service. I might be a little more generous to a pizza deliverer, however, since they do take the effort of driving to my house.
you must not be an American its not included in America its not included and you need to tip the pizza guy. You are sitting on your fat lazy ass having food deliverd to you and all you have to do is call and answer the door. You pay for the convenience factor. At a restaurant you have to get dressed drive sit and wait for your food and talk to the waiter. With delivery you get all the comforts of home, good food and all you have to do is give a few more bucks. just think of the gas or (petrol if your not American) you save by getting it delivered. I used to be a delivery guy and its allot more risk getting your fat lazy ass your food. So give the guy/girl a minumum 3$ tip but more like standard 5$
you probably have gotten a few snot balls in your food for being a cheap lazy bastard!!!! 3$ minimum chunky!!!