My intention is for it to be returned, whilst also sharing an entertaining, and educational message with the community. Don't let your domain names expire otherwise anyone can have them. ¯\_(ツ)_/¯
Eh, that’s exactly what I’d do. Register it, get a LOL out of it, then hand it over. I’d even give it to them for free. It’s funny and it’s harmless and teaches them a lesson with some mild embarrassment.