The strangest thing I've experienced was when I came home and my brother had sex on the couch but I did not notice it first (I would sneak on them to scare them because they watched a movie and I did not notice that his girlfriend moaned) so I snuck in through the door, took off my shoes and jumped into the living room.....
They got scared but I got also scared ( I was 9 ) so I ran, put on my shoes and ran to my bestfriend ( that was my brother's girlfriend's brother ).