Oh man, that was funny.
In the house I grew up in, we had a chinup bar in the hallway inbetween my moms room and mine. My brothers and I used to open both bedroom doors so we had a 'hallway' to get a running start before leaping to grab the bar.
One day my older brother and I were having a contest who could jump the farthest and grab the bar.
So, I got a running start, jumped as far as I fuckin' could, and was only able to wrap my finger tips around the bar. By the time inertia carried by body to a near horizontal angle, my finger tips gave out and I landed flat on my back. Knocked the wind out of me and everything. Shit hurt like hell.
Looking back, though, if it were on camera and slow-mo'd, I'm sure it'd be one of the funnier things I've seen in a while.