I guess we WERE the difficult children. We had a party at our flat. The sort of party where we gathered up everyone's car keys as they entered, and expected to find people passed out all over the place in the AM. It was an invitation only party.
The next day, early in the AM, I got up to pee and heard a noise from the bathtub. I pulled the shower curtain aside to see a male I'd never seen before passed out in the bathtub, flat on his back with his legs up the wall. I contemplated this, woke husband to help me roll him on his side and fold him up so he wouldn't choke if he puked, covered him up with a sleeping bag, and we went back to bed.
When we all got up in various states of hung-over/burnt out, we fed everyone, including our stray whom NO-ONE knew, and got started on cleanup. Said stray disappeared right after breakfast.
We have no idea how/when he showed up, no one remembered seeing him there during the party, but somehow, he wound up spending a few hours passed out in our bathtub, getting handed a plate of food in the morning, and left, all without saying a word.