Before the internet, everyone knew that if you swallowed a watermelon seed that it would grow in your belly. Ipsofacto, if you swallow gum, a gum tree would grow. It is known
Edit: And of course, the seven year itch.
("Kookaburra sits in the old gumtree, eating all the gum nut he can see...")
:- O
I was confusing kookaburra with chupacabra, and I also confused capybara with chupacabra too... and umpires with vampires... being a child was terrifying. LOL