Your buyer makes an order and you discover that what he is selling might get him in trouble with the law in the future. Perhaps he’s violating a trademark.
This guy was selling two mugs, one with the words The Walking Dead, another one with The Talking Dead, both are named after TV shows, so you can’t use them.
Before I got started, I told the guy to beware of the trademark trolls and how he might get into trouble for selling that. He accused me of having a negative attitude and demanded a cancellation, which I granted.
Lesson learned, next time I’m keeping my mouth shut and let them suffer the consequences later. Like they say, no good deed goes unpunished.