How cold does it have to be to freeze a waterfall anyway?

Pretty cold I guess, but the question that really bugs me is “how crazy do you have to be to climb one of these babies?” I mean besides the fact that they don’t make them much steeper than this, they must be slippery as hell! Yeah, sure, you’ll say that with the right equipment it’s doable, but still, I think it’s just nuts.

Did I mention I’m not big on adrenalin rush? And no, that doesn’t mean I’m a coward!