In reply to olliemartin:
The mountaineering club goes back a long way, to the birth of the uni I would suspect. My Dad has mentioned its existence while he was there in the early 70s. Outdoor Soc is the other society with a long history - I believe at first they were effectively the bog-walking society doing very grim long walks across very grim bogs.
I was a member of YUMC in 2007/2008 but I spent most of my time at York with Ben Lairig, who were the backpacking/hill walking/scrambling/winter stuff club. While I was there the mountaineering club was solely a cragging and bouldering club, and even walk-ins to places like Raven Crag were met with disgust (okay, it is steep). At this time Outdoor Soc was largely the uni's day trip society for foreign students. Ben Lairig and Outdoorsoc actually merged following some exceptionally bad decision making by the YUSU exec a couple of years ago but I believe Ben Lairig has since been officially ratified.
The best things YUMC and Ben Lairig did together was pub orienteering. Do you still do that? If not, you're probably wise. You get a map with 15 pubs on in the city centre, and in 90 minutes pairs of drinkers/runners have to get round as many as they can. You got points for getting to the pub - picture evidence required - and more points for drinking in the pub (more picture evidence). The number of points for each drink varied according to strength, you got bonuses for downing stuff, and I think you got bonuses for photos of novelties like a Ghost Walk, Whip-ma-Whop-ma- Gate, that sort of thing. When me and a mate won by visiting every pub and drinking in most of them the way to try and curb ridiculous drinking was to increase the number of pubs to 20. That way people would surely spend more time running around and less time drinking, right? No. Next time we did it we visited all 20 pubs and between us did 36 shots of whiskey in the 90 minutes. The weirdest thing is that when you finished you are still sober. Ten minutes later, less so.