Who said "Hehehehe, you said 'duty'."?

This quote is attributed to Beavis.

Hehehehe, you said 'duty'. - Beavis

"Hehehehe, you said 'duty'."

Beavis Humor

"Heh heh, like, this sucks"

"Heh heh, that was cool"

"Like, we're like, the coolest guys ever"

"Heh heh, fire, fire!"

"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."