Hair Ball Pads
Cats use litter boxes to do their business, and all animals are attracted to do certain business on different pads designed to fool them to do so by scent. If you have a cat then you already know it will use the litter box, but puke anywhere and only cough up a hair ball on the carpet, where it is comfortable for them and smells strongest, like the comfort of the indoors at home. If we scent a (Wee-Wee Pad type) pad, where the cats are feeling attracted to expel the hair balls and place them on the floor then, we never get disgusting hair ball juice on us ever again!
All attraction it needs is a certain scent placed in the right place conveniently and textured for the pet.
Reward: To be proven that a cat wouldn't rather find a proper place to do this since it is in discomfort!