Who said "I believe the answer is... down."?

This quote is attributed to Ralph Wiggum.

I believe the answer is... down. - Ralph Wiggum

"I believe the answer is... down."

Ralph Wiggum Humor

"I'm in danger."

"Me fail English? That's unpossible."

"Eat my shorts."

"Ay caramba!"

"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."