Who said "Life's too short to be nice all the time."?

This quote is attributed to Nelson Muntz.

Life's too short to be nice all the time. - Nelson Muntz

"Life's too short to be nice all the time."

Nelson Muntz Life

"Ha-ha!"

"Your tears of unfathomable sadness!"

"I'm gonna enjoy this, Bart. I'm gonna enjoy this a lot."

"Eat my shorts, Simpson!"

"Life is meant to be lived with passion."

"Life is what happens when you're busy making other plans."

"Life is a journey, not a destination."

"Life's too short for regrets."