Riding a bike on a slackline high up in the mountains is psycho madness

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.