Who said "That's the dumbest thing I ever heard."?

This quote is attributed to Red Forman.

That's the dumbest thing I ever heard. - Red Forman

"That's the dumbest thing I ever heard."

Red Forman Humor

"My foot in your ass."

"Dumbass."

"I'm gonna put my foot in your ass."

"That's what I love about these high school girls, man. I get older, they stay the same age."

"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."