There is that one weird fact that everyone has to know. Which one do you know?
I'll start with a few:

The defense mechanism of the sea cucumber is to eject its toxic internal organs out of its anus, causing the predator to eat them and die.

If you feel the need to stab someone, stab oranges. They have the same consistency as human flesh.

If you shake/jangle your keys at a moth, it will do a back flip as a defense mechanism.

Many deaths in the Middle Ages resulted from pigs wandering into peasant homes and eating babies out of their cradles.

Necropants are a pair of pants made from the skin of a dead man, which are believed in Icelandic witchcraft to be capable of producing and endless supply of money.

One pound of sugar per 1,000 pounds of concrete will ruin the concrete and it will never set firm.

Go ahead and go crazy in the comments