It's hard these days to get people to fall for a good April Fool's Day joke. But students at one college pulled the perfect prank on their professor.

The professor has a rule that if a student's phone starts ringing in the middle of class, they are required to answer on speakerphone so the entire class can hear the conversation.

In a classic coups, this group arranged for a friend to call a girl in the class and ... well, just watch for yourself.