Who said "Never underestimate the power of a well-timed joke."?

This quote is attributed to Agatha Harkness.

Never underestimate the power of a well-timed joke. - Agatha Harkness

"Never underestimate the power of a well-timed joke."

Agatha Harkness Humor

"Well, hello, dearie."

"The real question is, what are you willing to do to keep what you love?"

"Power isn't given, it's taken."

"I'm not a witch. Well, not a traditional one anyway."

"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."