I've often thought bout using a chock. But then I remember... my emergency brake works. (a lot don't)
So... did you go over, and yell at him?? (saying, you are tying up the ramp !!)
It both sucks... and is funny. (sorry)
****EDIT***
That's a new explorer. His brake should have worked too. That looks more like he didn't even put it in park.