Just tell a fact that you find interesting.
We are going to get a lot of "WE FART POOP AND JIZZ LOLOLOLO!!"
But I got one:
We humans use only %10 of our bodies full power on a normal day.
When adrenaline kicks in, it bumps it up to %50.
A well known story is a new mother, 20-something years old, lifts part of a bus to save her infant who was run over by it.
Why only %10?
If we were to use %50 of our full power normally, we would literally tear our muscles to pieces.