Who said "A smile is just the answer to a riddle no one asked."?

This quote is attributed to Riddler.

A smile is just the answer to a riddle no one asked. - Riddler

"A smile is just the answer to a riddle no one asked."

Riddler Humor

"Riddles are the most honest form of communication - they demand truth wrapped in mystery."

"A mind that cannot solve a puzzle is a mind that cannot live."

"Questions are the doorway to knowledge, answers are merely the threshold."

"The greatest riddle is why people fear enlightenment."

"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."