On the first day of school, a teacher asked her class, "Who here is a Mets fan?"
Every student knew that she loved the Mets, so they replied bye raising their hands, except for one girl, Rosie.

The teacher asked, "Who do you like, little girl?" Rosie replied, "I'm a Yankees fan and I hate the Mets."

The teacher asked why and Rosie told her that her parents were Yankees fans, so she was too. The teacher said to the class, "So if Rosie's parents were idiots, what would that make her?"

Rosie chimed in, "A Mets fan!!!"