Who said "Laugh at yourself before enemy do."?

This quote is attributed to Hulk.

Laugh at yourself before enemy do. - Hulk

"Laugh at yourself before enemy do."

Hulk Humor

"Hulk is strongest one there is."

"Don't make me angry. You wouldn't like me when I'm angry."

"Puny god."

"Hulk smash!"

"Never underestimate the power of a good laugh."

"Laughter is the best medicine."

"A good laugh is the best medicine."

"Laughter is contagious and wonderful."