[vmlinuz]

A few years ago, I was almost forcibly prevented from leaving a Hawaiian burger joint in Nagano by a waitress who was concerned that I'd accidentally left some money on the table. I tried to explain that it was a tip, but they were quite unhappy to let us leave until we'd taken a couple of little candy canes - it was Christmas - from the display in their window...

Tipping is not a thing in Japan, generally. I've read that it can be considered faintly insulting, given the service culture - you're implying the recipient wouldn't have done their job properly unless you gave them extra money.