Who said "Courage is having your friends back you up."?

This quote is attributed to Nelson Muntz.

Courage is having your friends back you up. - Nelson Muntz

"Courage is having your friends back you up."

Nelson Muntz Courage

"Ha-ha!"

"Your tears of unfathomable sadness!"

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

"Eat my shorts, Simpson!"

"Never let fear stop you from chasing your dreams."

"Courage is being afraid but doing it anyway."

"Sometimes you gotta do what you gotta do."

"Sometimes you have to be the monster to stop the monsters."