I'd heard that people actually did this, but I guess I never really believed it

I've read about it, and I've seen clips on youtube.  So I know that it's real, but I guess part of me never actually believed it till I saw it with my own eyes.  Last weekend I was walking by Boston Common, and I saw people playing Quidditch.  And I'm not talking about a few kids messing around.  There were teams in uniforms.  Referees with whistles.  Even fans sitting in the bleachers and cheering.  I can't really fathom how this is possible.

On the off that chance somebody doesn't know, Quidditch is a FICTICIOUS game made up for the Harry Potter books, in which wizards fly around in the sky on brooms.  The problem is that in real life, people can't fly.  So the kids who play Quidditch just run around on the ground instead.  This makes sense to me, except for the fact that they do it while pretending to sit on flying brooms.  I can't imagine how annoyed, uncomfortable, and stupid I would feel trying to run, throw, and catch, while also holding a stick between my legs.  Whatever is going on the heads of the people who enjoy doing this is something I obviously can't comprehend.

Am I looking at it from the wrong perspective?  Maybe it's just theater, and not a competitive sport.  And yeah, I know the picture sucks, but I was kinda scared to get too close.