I know that there are plenty of threads on the merits of tipping, so it is not my intention to start another one.

However, sometimes people requesting tips can be quite blunt and aggressive, so I started this thread to share stories.

I rode a taxi once (in the US, can't remember where) and the meter read just under $10 so I handed the driver a $10 note. He looked at me and said "thank you" and then added "it is customary to give a tip to taxi drivers". I took out my wallet and handed him a $1 note. He thanked me again and got out to open the trunk. After handing me my bag, he said "you know, the customary tip is 15 to 20%". I didn't like his attitude, so I just said "I don't have any more money" and quickly left.

Any other stories to share?