Instant Beard

Instant Beard is the fanon name of a magic formula used by both Gargamel and Brainy Smurf in the cartoon show episode "Symbols Of Wisdom". This formula gives its user the ability to grow facial hair on faces that wouldn't be able to grow such hair for various reasons, although the side effect of using this formula is that the hair grows to such incredible lengths that it traps its user to the point of immobility, meaning that the user will not be able to do anything. Not even cutting the facial hair will help, because it would simply regrow just as it is being cut. The only cure for the Instant Beard formula is a chili bean in the user's mouth and the chant, "Chili bean, chili bean, listen to my plea; chili bean, chili bean, set me free."

Empath: The Luckiest Smurf stories
In the EMPATH: The Luckiest Smurf story series, Miracle Smurf as an adult has perfected a variation of the Instant Beard formula so that it could grow facial hair of standard lengths that could be easily trimmed without any negative side effects. However, this formula hasn't really been of much use by any of the Smurfs.