Memorable ''Will & Grace'' guest stars: Kevin Bacon
The famously ubiquitous actor appeared as himself in 2002, in an episode where he hires Jack as a personal assistant and asks him to find the identity of the star's stalker who is, of course, Jack himself. To Jack's horror, it's Will who gets to share a fantasy moment with Bacon, as the pair bust some moves together in a Footloose-inspired dance. ''The bastards wanted to hire a dance double,'' Bacon told EW at the time. ''But Eric stood up for me. He said, 'I think the old boy can still do it.''' As it turns out, he can.