a shot of life
A person who brings the chaos and the fun, even if they are slightly confused. They may not be the smartest, but they are full of energy and the kind of spirit that makes you want to laugh, cry, or just throw a shoe.
My niece drew on the wall with permanent marker. That was a shot of life.
My friend tried to ride a bike without wheels. That was a shot of life.
My dog chased a chicken across the street. That was a shot of life.