A childhood belief about speaking

I used to think that booby traps had something to do with actual boobs or bras or something. I think the idea was a combination of it being referred as a "booby" trap and the fact that the first time I heard it was in a movie where these boys were trying to sneak around and they got stuck in a line of bras that were tied together. One of them said, "Oh no! It's a booby trap!" Needless to say, I felt really stupid when I found out it just meant someone had set up a trick or trap for someone else.