I've had servers get upset that I tip below what they feel they've earned. One incident was when me and a few friends had dinner at a Steak and Shake. The total, for all 4 of us, came to about $60. I tipped $5, but I didn't quite have enough to tip the extra $3 that I normally would. Still, I thought $5 was fair because aside from our initial orders, we didn't bother her the whole time we were there. On top of that, I bussed the table. I always have everyone put the plates, saucers, cups, etc., in the center of the table, and I wipe down the table as best as I can, to remove some of the work required to get the table ready for another customer. So I paid for dinner (it was on me that night), and I walked back and put the $5 on the table. As I was walking away, I heard her say "Five dollars? What a cheap ass!" Sometimes you get people like that. Not all servers are like that, though.