It wasn't exactly SO's gift, but he was connected to it.....
His sister gave me a pair of black lacy crotchless underwear as my only Christmas gift from that side of the family. In front of everybody. I'm pretty conservative and wouldn't have thought this was funny under ANY circumstances, let alone in a large group. The SIL thought she was pretty hysterical.
Turns out my spouse KNEW about it ahead of time!!!!
No one else was given a gag gift, so who knows the intent of that kind of a gift.
No one could understand why I was so hurt, including the spouse. It would have been different if they had at least had another gift that was more reasonable. Especially since I'd given each of them a thoughtful gift.