I was 6, my grandpa had a bunch of VHS cassettes with movies / cartoons & such, one day i was alone and wanted to watch a cartoon but the cassettes were too high, however there were some of them down, i couldn't open any them cuz they had a plastic cover and it was hard to open but there was one with no cover and a "xxx" symbol on it, so i was like " hey i never saw that one let's try it out ".... i remember it was an old one ( even for that time ) so i couldn't really understand what was going on cuz there was so much pubic hair.....
At some point my grandpa came back home, he saw me watching it and he looked at me with a face like this :
He then said don't tell your grandma or i'll die, and randomly left the room....
(I didn't wanted him to die so i didn't told her
)