Laugh

A laugh is an expression that is normally used to express happiness when someone experiences something humorous that they take pleasure in noticing. Laughter can take on many forms, from a quiet snicker to a very loud guffaw. In mainstream Smurfs media, the Smurf character Jokey is commonly associated with this expression.

Empath: The Luckiest Smurf stories
In the EMPATH: The Luckiest Smurf story series, laughter is an expression that most creatures and living beings except for Psyches engage in, due to their particular belief about emotions being the enemy to logic and reason. Empath, having all memories of his emotions as a Smurf erased by the Psyche Master, found out about laughter when Jokey played a prank on him, but was unable to respond to the prank with anything but shock and wonder. In fact, Empath was unable to laugh until a few visits to the Smurf Village later, which from then on changed his normal emotionless expression among the Smurfs to that of a smile.