http://www.youtube.com/watch?v=Ocl3dJ-z9FU&feature=popular
That is all. Feel free to post more.

1st time I see an hippopotamus on a treadmill.

I see dickheads on treadmills

If those fails aren't intentional then they must already be brain damaged. I call those fails because, regardless of the intent, they all fail on a more epic level than falling on a treadmill.
I had a good fail sign that warned people about drowning by having "lol" amidst wavy lines.

http://www.youtube.com/watch#!v=YersIyzsOpc&feature=channel
Greatest (Real) freakout of all time. This kid has serious anger issues and there is like 10 other videos of him freaking out. HILARIOUS.

Hate to break it to you but that's a well known fake. The fact that there are 10 other videos kinda confirm this, don't you think?

It was part of the joke. :) AKA in a fail thread.

Hahaha... Why would you even try pogoing onto a treadmill...

So in order for this thread to be a success, it's got to fail? This is like the cat strapped to toast thing again, isn't it?

Maybe, but have you ever been as entertained as watching a cat strapped to toast?
The only reason I can think of why someone would do that, is because he is not destined to contribute to the gene pool.

That would be an amazing thing to see.