1x41 - The Twilight Zone

A depressed dentist, Myron Mandel, is visited by the Tooth Fairy, who grants him the wish to be incredibly popular and loved. The wish is granted in full force, and soon Mandel can't handle the endless stream of visitors singing his praises. He flees, only to find himself on a train with a bunch of other hobo/dentists who similarly wished for the same thing.