Who said "Laughter is tears we can't cry."?

This quote is attributed to Droopy.

Laughter is tears we can't cry. - Droopy

"Laughter is tears we can't cry."

Droopy Humor

"I'm so happy."

"Hello, I'm so glad to see you."

"That makes me so sad."

"I'm afraid I have some bad news."

"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."