mandatory tipping

I went to a coffee shop today for a cup of coffee and a yogurt. The price was $5.60; I handed the lady $6, and she didn't give me my change. I had fully intended to put it in the tip jar - I do that a lot. But I wasn't even given the option. For some reason I feel offended by this. And don't tell me that she remembered me and that she knew I'd put it in the jar. I don't go there that frequently, I order very different things, I get lots of different checkout people, and I often keep the change.

I wonder when they decide to just keep it. I assume they'd only keep coins - so that if my order was $9 exactly, and I gave them a $10, I'd get my dollar back. I probably would get my dollar back if my order was $19 and I gave them a $20 too, even though that's a smaller tip than they took from me in this case. And I'm sure that I'd get my change if my order was something like $1.33 and I gave $2.

This is also the coffee store that refuses to take $20's after like 3 in the afternoon because they run out of small bills. They need some new management. If they weren't the place with good yogurt parfaits, the richest coffee, and a good selection of loose tea I'd stop going.

Someday I'll open my own cafe. The checkout people will give you your change, they'll always have plenty of small bills, and the menu will definitely have a 'bottomless cup of coffee' option.