In the 90s there was a rumor going around at the school I taught in that pressing F12 would cause the computer to explode. Everyone (even some of the other teachers) believed it, so I would scare the class by pressing F12.
A childhood belief about technology

others believed things like this
- I used to belief that women had babies by pressing their belly buttons!— amy
- Pressing on the gas pedal means that your car can do anything...including going up a vertical wall.Anon
- My friend and I used to believe that we could gain special powers by pressing our bellybuttons and wishing.— Andrew
- I believed that our teachers lived at school. They were teachers--they had no reason to leave :)(Anon
- When I was 7 my brother told me that when the space of the computer runs out it will explode.— Sam
- There was a popular rumor back in grade school that BUBBLE YUM gum was made with spider eggs.— Amber