I used to think that if you were scared "half to death" that you only had one scare left before you died.
I used to think that when people tried to commit suicide by jumping off a building, the ambulance crew would be waiting for them with a safety net at the bottom, and it seemed kind of funny, because falling from a tall building in the city would take at least one minute, so they'd have to set it up very quickly.
I used to think topping yourself meant killing yourself by spinning upside down, like a spinning top!!
When I was child I used to believe that the person who died in a movie , died in real life
When I was a child, I used to believe that people really died in movies.
I owned three fish when I was seven, but two of them died before the third one.
I still put enough fish food in for three, though, because I thought the food would float up to Heaven to feed the dead ones.
This one sounds a bit grim, but is still funny: I used to believe that when someone died in a hospital, the coffin was kept under the floor or behind the wall, so when the life support machine went off and they died, the body would go through the machine and into the coffin, ready for the funeral.
I used to think gravy was made in graveyards.
This one is a bit obscure, but my dad once told me that humans can be put down in Sweden, like with animals at the vets, and although he was obviously joking, Sweden is still a high rate suicide country, so that must be why he thought of it. Still funny that I believed it anyway.
I always thought that being buried in a cemetery or graveyard meant the undertakers would take the body out of the coffin and was relieved to find out the opposite at my grandpa's funeral. That would be so creepy.