Words fail me

I never understood the whole parkour thing, but this...I've already watched it three or four times and I can't stop laughing. Ladies and gentlemen, Jurassic Parkour!

I think it's the floppy T-Rex head that got me.

Then, I found this:

Make sure you have your volume turned up for the second one - it's funny enough without sound, but with the music...OH. MY. GOD. GENIUS!!!

I don't know who these people behind these videos are, but they're absolutely brilliant.