Is grass mankind's greatest foe?

The hilarious collection of clips in the video above all have two things in common.

Firstly, they all feature humans. People just doing everyday things like ridiculous leaps, stupid bike stunts and ill-advised outdoor acrobatics.

Secondly, they all feature grass.

That's right, grass. In every instance where somewhere comes a cropper, grass is present.

Is the green stuff mankind's greatest foe? Take a look at the videos and judge for yourself.