Right after looking for my fart fact for the other thread I started looking at other facts..........WOW!!!

There are so many I didnt know.
So here I go starting a thread asking you all whats the strangest/amusing/weirdest fact that you know or have found out?
To start you ok this is one that made me chuckle,
frogs can't swallow with their eyes open
Whats your one???
It can be about anything!!