Urban legend highlight: Stays in your stomach for seven years
Believability rating: 3

If gum really stayed in the human stomach when swallowed, every elementary school student who snuck gum into class and then had to swallow it to hide their contraband would have to get their stomach pumped of strawberry Bubble Yum or fat, juicy pieces of Bazooka. The human body is super good at digestion and while it can't tolerate the synthetic stickiness of gum, the small intestine takes that load and then it all gets emptied later—generally in one piece. That's because gum is made up of a bunch of rubbery, indigestible chemicals that the body doesn't want to assimilate, so it will push it out. Unfortunately, not in the form of the ultimate rectal bubble.