I'm really not sure how to react to this...

http://www.myfoxphilly.com/story/27573838/video-biker-rides-dirt-bike-on-roller-coaster

I can't decide whether I should be with amazement or "wow, he's stupid."

Probably a mix of both!

Based on the Red Bull sponsorship and all that seen on the Bike, I think this was done with park permission as a stunt. Red Bull has been known to do that. And while it seems kinda crazy...most of their stunts are. I would also figure EMT's were on standby nearby just in case.

As for info on the specific coaster: it's a wooden racing coaster in Mexico called Montana Rusa, at La Feria de Chaputepec (stated in the link above). The ride is 110 feet tall- the same as Kings Island's Beast- and opened in 1964 as the tallest roller coaster in the world. It is also 4,000 feet long, and is a racing coaster.

Pretty cool, but let's see him on an impulse coaster track, LOL!

I would never do that in a million years, but that does look pretty sweet!

.....and now for our next act......

Do notice that there were many an individual placed throughout the course. Presumably, these crews contained EMT's and other resources capable of responding should the need arise.

That reminds me of this:

.....and now, we have a visitor, Topo Gigio....