I had just moved into a new apartment in Germany.
My apartment was on the 2nd floor and had a large window which looked out over the flat roof of the ground floor apartment.
The landlady lived on the ground floor and her son and DIL on the first floor. This is all relevant.
That first evening I went to a works Bonfire party. I cycled and wore many layers of clothes. When I came home quite late I was tired and just wanted to get into bed. I took off all my layers of clothes in one go - so knickers, woolly tights, leggings & jeans, and because they were a bit ashy from the bonfire I shook them out of the window.
As my knickers flew out I realised this wasn't the best idea. Unfortunately they landed on the flat roof so I knew that in the morning, my landlady's son would look out of his window and see my pants on the roof.
They would know they were mine. I had been there ONE day.
My O level German had not taught me to say "excuse me but I've thrown my knickers on your roof".
"Luckily" the landlady was coming up to the flat with some cake later, just to get to know me. How lovely. So in she came, and I knew I had to tell her. I encouraged her to come over to the window and showed her my now soggy, rather sad looking knickers and completely failed in explaining how they got there.
Anyway, the next evening when I came back from work I found my knickers in a little bag hanging on my door handle. Her son had gone onto the roof to get them and returned them to me. I was mortified.
The rest of my year there went smoothly.