In the 2014 World Cup, footballer Luis Suarez ran across the pitch and, off the ball, bit Giorgio Chiellini in the neck.
It was one of those absolutely WTF moments where you can't imagine what someone could possibly be thinking.
I call these sorts of choices "Luis Suarez moments."
Until I suffered an unfortunate stint in a higher education administrative role, I had no idea that this sort of thing was so common off the field as well.
Not biting, mind you. Just absolute WTF actions.