Frowning takes 68 muscles.
Smiling takes 6.
Pulling this trigger takes 2.
I'm lazy.
This fits in with my own theories about human evolution.
We are the only Primates to habitually walk upright.
We are the only primates to have entirely freed our hands for use.
We are the only primates to have lost our canines.
We are the only primates to feed to such a large degree on meat.
ERGO, before modern “humans” came to be, our immediate ancestors were actually “formed” by the use of weapons in food getting and later fighting.
WE really are “The Killer Apes”.
That explains why we blew it all to hell.