Wisconsin Badgers -- Crazy Fan Jumps Off Streetlight ... In Post Game Madness

Here's a video of an insane Wisconsin fan ... JUMPING OFF A STREETLIGHT ... in the middle of a "We Just Lost the NCAA Championship" party in Madison Monday night.

You can see the crowd of people below sort of break the guy's fall -- and a bunch of people in bright vests (probably cops) rush in to handle the situation.

We spoke with a rep for the Madison PD who tells us the jumping was really an isolated moment of stupidity -- and for the most part, the students and fans were pretty peaceful.

As for the post-game party stats in Madison -- 5 arrests (but of those only 2 people were booked).

No property damage or injuries were reported ... so, we're guessing jumper guy is ok.