Add Yahoo as a preferred source to see more of our stories on Google. The playground can be a tough place for adults, especially when you're overconfident on the monkey bars. Get ready to laugh your ...

Add Yahoo as a preferred source to see more of our stories on Google. Brace yourself for non-stop laughs with the ultimate best fails compilation! From epic slip-and-slides that go hilariously wrong ...

From simple mistakes to totally unexpected wipeouts, this compilation prove that everyone has those moments where everything goes wrong in the funniest way possible.

We thought we had seen the best parkour fails when we posted our original "Ultimate Parkour Fails" last February. Well, turns out you guys had more to offer, so here is the Ultimate Parkour Fails Part ...