This may be the most extreme thing you'll see all day. Or week. Or year.

In this video that may reinforce your fear of heights, a team of 558 adrenaline junkies BASE jumped off of Dubai's Princess Tower, which just so happens to be the world's second tallest residential unit at more than 1,300 feet high.

The team jumped off the 99th floor, which sounds about as frightening as it looks. They pulled off all kinds of stunts, too, ranging from pyramids to flips to ziplines to free jumps in the air. There's even one guy in a wheelchair, which is definitely not something you see everyday.

These guys may be tough or crazy. We're just not quite sure which one.