It's already hard enough to just go mountain biking where there are no trails. It's already hard enough to just walk on a slackline suspended in the air. So naturally, it makes perfect sense to go mountain biking on a slackline. Wait. What? That's what Kenny Belaey did. He rode his bike on a slackline over a 367-foot drop in the French Alps.
The whole video is worth watching, just to see the crazy stuff it takes to get to the point where he can do something even crazier.