The additive of choice for the modern
spitball.
K-Y Jelly's most famous user was baseball pitcher Gaylord Perry, who took cheating to a higher level with the aid of this fine lubricant. It serves the same purpose as spit in making the pitched baseball do funny things, but is harder to catch because the pitcher doesn't have to bring his hands to his mouth.
Manager Gene Mauch declared that Perry "should be in the Hall of Fame with a tube of KY jelly attached to his plaque." He did make it to the Hall of Fame, but Johnson & Johnson didn't get the free endorsement.