On a 'Batman' episode, Catwoman fell off a ledge in a cave or something and Batman held Robin back, saying "Watch it, Robin! It's a bottomless pit!" I had never heard that phrase before, so I thought he said, "It's a bottom of spit!" I was picturing a pool of saliva at the bottom of the hole.
A childhood belief about tv shows

others believed things like this
- I used to think "Robin Hood and his merry men" was "Robin Hood and his *married* men."Anon
- My dad thought robin feet were made out of wood because they look like twigs.— Molly
- I used to think that Batman was Blackman. He wore a black superhero outfit, so it made sense to me.Anon
- I used to believe that your belly button was what held your top half to your bottom half...— Debelouwho
- I used to believe that when you had cancer, your bottom would be in front instead of in back. Anon
- I used to believe that your bottom teeth were actually in your bottom— jez