Eighteen years after his fame peaked with The Karate Kid, former big celebrity Ralph Macchio has discovered a new, lucrative career in the rapidly growing field of washed-up celebritydom. 'I just recorded a cameo on King Of The Hill where, after Bobby gets cast in a movie, I explain to him that fame is fleeting,' Macchio said Monday. 'And I taped a Drew Carey Show appearance where I woo a girl away from Drew, and he moans about how he's 'even losing chicks to Ralph Macchio.'' Macchio will also appear in an upcoming Stanley Tools ad, in which, over an image of his face, the announcer says, 'Some things come and go, but Stanley is forever.' 