I was watching the amusing "DRAG ME TO HELL" and there was a scene in the movie that parallels to this thread.....

Waitress: So you're just going to sit here all night, drinking coffee?
Christine Brown: Yes... No! Maybe! Whats it to you?
Waitress: Honey, I'm working a job where tips is my living, and coffee drinkers DON'T TIP!
Christine Brown: [Holds up envelope containing the cursed button] You keep the coffee coming honey, or I'll give you a tip you won't forget!



As original threader to this lively discussion I still stand by when dining out...
Good Service Given = Tip% Based on Bill Amount Left Behind In Return When Leaving....

Still... I experience the now and then not followed up on drinks or trying to get the waiters attention to get another drink or could I get more of this but gets dissed or he/she takes off too quickly to get a word in edgewise. I really HATE THAT and I don't like begging for something I wanted 5 minutes ago!
Sorry bet I penalize for service like that. Just the other nite as me and my roomates were leaving I purposely sifted $1 out of the tip. Yes, I am cruel but when the waiter did not acknowledge/attend to my needs I have ways to return the favor.