I used to think that the record button on a tape deck would make it blow up.(i.e: REC=Wreck) I'm pretty sure this wasn't a theory I'd come up with on my own. My dad agreeing with me may have helped to perpetuate the myth!
A childhood belief about around the house

others believed things like this
- I thought the “rec” button on tape recorders said wreck and it would wreck your tape if you pushed it!— Alberto Richardson
- I used to tape my mouth shut at night in case a spider would come along and make a web in my belly.Anon
- I used to think a world record was a record of all the people in the world singing .— JACK REGAN . [SWEENEY . ]
- My dad told me that when he was little, he thought the trees waved back and forth to make the wind blow.— casey
- I used to think that if you didn't blow your nose and just sniffed the snot up, you head would blow up.Anon
- i used to think belgium was a myth.Anon