Who said "Work hard, but don't forget to have fun doing it."?

This quote is attributed to Kenny McCormick.

Work hard, but don't forget to have fun doing it. - Kenny McCormick

"Work hard, but don't forget to have fun doing it."

Kenny McCormick Work

"Mmph mmph mrmph!"

"I'm not fat, I'm just big boned"

"Dude, we're in third grade"

"This is so cool"

"Hard work never killed anybody."

"Work with purpose and integrity."

"Hard work pays off in the end."

"A man's gotta do what a man's gotta do."