I think I've received two shockers that are worth mentioning.
For our wedding, SIL gave us a sculpture of what I assume to be Buddha with five little children/babies crawling all over him. It is truly hideous and lives in the back of a cupboard. I dare not throw it out in case she ever asks about it.
For Christmas four years ago, Dad gave me a battery-operated sewing machine, which I'm pretty sure was actually for a child learning to sew. Firstly, I don't sew. Secondly, I was 35 at the time. That one got donated to charity in the hopes that someone else could enjoy it.