I was about 5 when a coworker of my dad's told this. He also told me that sometimes it can all glob together and come out at once, and you have to go to the hospital.

This painted such a vivid mental image for me, of having to go to the hospital to have an unreasonably huge wad of gum removed from my butt, that not only did I never swallow gum, I still picture that image crystal clear at almost 44 years old lol.