OK, the door handle. It was an honest mistake rather than an accident, and it wasn't at Christmas.
I live in a Victorian terrace which still has all the original interior doors and door furniture. It's also the style of house where one room leads into another.
A relative had an appointment in my city and came to stay while I was away on a work trip. They were on their own in the house. Like another poster's FIL they are quite heavy handed. In particular, and I had noticed this previously, they open doors by grabbing at the handle and kind of yanking. They don’t turn the handle all the way down.
I'm sure you can see where this is going...
It turns out that antique door handles don't deal very well with this type of treatment. Relative found themselves in my living room with the door mechanism completely jammed. At this point, they are in a pickle. They can leave by the front door, but they can't get into any other room in the house...
So they trot around and knock on all my neighbours' doors, until they find someone who they borrow a screwdriver from, then come back and unscrew everything from the door until eventually they get it open.
I came back a couple of days later to find the mechanism in bits on the coffee table, and no explanation of why.
Suffice to say the door has never stuck before or since, and I don't let them stay at mine on their own any more...
I have no strong feelings about flannels.