Frasier: 10 Guests Stars You Forgot Were On The Show
3. John C. McGinley
In Season 2, Episode 11 Martin Crane is appalled that his sons can't fix a broken toilet. The boys challenge themselves to fix it themselves, before calling the plumbers in to do it for them.
It doesn't take long for the brothers to recognise that the plumbers they have called in are actually a pair of brothers they went to junior high with. Danny and Billy Kriezel are former high school bullies who used to try and flush the Crane's heads down the toilet. Obviously, they became plumbers as adults.
Best known as Dr. Cox from Scrubs, John C. McGinley stars as Niles' high school nemesis and plumber Danny in 1994's Seat of Power.