I used to belive that if u looked into a mirror while you were doing your "dirty work" your mirror-self would turn into your "dirty work"
A childhood belief about bathrooms

others believed things like this
- when i was younger i thought ac/dc's dirty deeds (done dirt cheap), was dirty knees and the thunder cheeks.— S
- a friend thought that the song "dirty deeds done dirt cheap" was saying "dirty deeds dunderchief"— dubs
- when i was young i used to believe that my image on a mirror would come to life if i broke the mirror.Anon
- I used to believe that there was a person in the mirror who looked exactly like meAnon
- I used to think that if I looked in a mirror for over 5 mins I would dissapere to Narnia!— Quako
- I believed that if I looked too long in the mirror admiring myself the Devil would appear.— Paul Elletson