I've posted many, many stories about my MIL here before - she's very sweet, but her sense of appropriate behavior and boundaries tends to be . . . nonexistent, really.
So MIL's mother died a year ago and was cremated. MIL and her three brothers got together on the anniversary of their mother's death and went to the city where GMIL had requested her ashes be scattered, at the old family farm. (MIL and her brothers all live in different states and GMIL's family farm was in a separate state altogether, so this was what MIL termed a "creunion." Cremation + reunion, I suppose.)
The farm isn't in the family anymore, but MIL had been in contact with the people who lived there a few years ago and they had told her they were fine with family coming to wander around the stream and the fields and whatnot if they were ever in town. MIL and her brothers did so, calling ahead - only to find that the people MIL had talked to had recently sold the farmhouse to someone new who had just signed the paperwork but hadn't moved in yet. As a result, there was no one to ask for permission to go inside the house and see what had changed (something MIL was really eager to do).
So the SS thing: MIL and her brothers scattered GMIL's ashes anyway, without actually talking to the people who now owned the property. And since MIL couldn't get inside the house, she scattered some of the ashes on the doorstep
so they'd get tracked into the house anyway, even without the new tenants knowing. I mean, on the one hand they're just ashes, but conceptually something like "I'd like you to track bits of this dead person onto your carpet, please!" kind of squicks me out