Welcome Back, Kotter: Season 2, Episode 12
Hark, the Sweatkings (23 Dec. 1976)
TV Episode - - Comedy
To get into the Christmas spirit, the Sweathogs give a homeless man a shave and a new suit. But after he shows up at the Kotter's Christmas party wearing his old clothes, he tells them he's a bum, but he's a happy bum.