Who said "Humor is the mask we wear to hide our pain."?

This quote is attributed to Penguin.

Humor is the mask we wear to hide our pain. - Penguin

"Humor is the mask we wear to hide our pain."

Penguin Humor

"I am not a human, I am an animal. A cold-blooded animal."

"You poor, unfortunate fool."

"Life's a bitch, isn't it?"

"I've been dead once already. It's not so bad."

"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."