Who said "Even happiness makes me sad."?

This quote is attributed to Droopy.

Even happiness makes me sad. - Droopy

"Even happiness makes me sad."

Droopy Happiness

"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."

"Babalú!"

"My greatest joy is making people smile."

"Laughter and love make a home."

"The best things in life are free."