Restaurants are different.
I usually tip at least a couple bucks...I tend to just order water instead of a drink. If the waiter doesn't have a problem with that I tip what the drink would've cost.
I've pitched in 10$ for tips on more than one occaision...depends if my mood strikes me and I had a great time b/c of the service.
In fast food tips rock. Working at a coffee shop...getting 5 or 10 cent tips is awesome. I serve so many customers...if they all gave me 10 cents I'd be making sweet money. I usually end up with about a buck at the end of the day.
meh
The best tip I like to get from people is a smile. A simple smile makes my day SOOO much better. There are sooo many rude customers...you wouldn't believe these people...I never thought it was this bad.
If you don't want to tip money thats cool. I don't expect it. But PLEASE give me a big smile...or make sure to say your pleases and thank yous. It means a lot to me when customers do.