I don't know why but I would do this. I'd probably be fine for most of it, then I'd become conscious of what I was doing part way through and fuck it up.
I was all drunk once, and let's just say had I been driving a car, that light pole would have been toast. Just thinking about riding along something like this makes my hands sweat and my skin crawl.
My god, it's not just how narrow the track is, it's also how close the left-hand cliff face is. If you clip your handlebar it throws you pretty much head-first into the death.