The theme is to treat someone the way you want to be treated.
Kobra is asking Melvin for his 'dwarf' pass,Melvin is terrifed at this moment.But,Kobra and Melvin aren't aware that Priscilla is standing behind them.Priscilla gets Kobra to lose grip of Melvin's neck and asks Kobra where's there leader,so Kobra gets Monk.
Monk appears and tries to get Melvin,but Priscilla gets Monk in a hammerlock.Then,Priscilla throws Monk into her locker and closes it.
The theme of this story is to treat people you want to be treated.
The verbal irony is that Priscilla didn't know who Monk was.
The situational irony is that Kobra was picking on Melvin and now Priscilla is picking on Kobra
The dramatic irony is that Monk is in the locker for a week and he doesn't know that.