Unhappily Ever After (1995)

S4E16 Teacher's Pet

After taking a career aptitude test, Ryan discovers he’s suited to be a teacher, leading him to step in as a student teacher in Ross's class. However, an unfortunate accident occurs when he accidentally stabs Mr. Moss, Ross's teacher, with scissors, resulting in Ryan assuming control of the class. Meanwhile, Ross's twelve-year-old girlfriend, Kitty, develops a crush on Ryan, prompting him to ask Tiffany to pose as his girlfriend to divert Kitty’s attention.