Teacher's Pet
S4:E16
1998
IMDb
Ryan's career aptitude test reveals that he should be a teacher, so he becomes the student teacher in Ross's class. Ryan accidentally kills Ross's teacher, Mr. Moss, by stabbing him with scissors so he takes over the class. Ross's girlfriend, a twelve-year-old named Kitty, has a crush on Ryan so Ryan has Tiffany pretend to be his girlfriend.