Didn't really ruin it, but made it a pain.
On my way to uni this morning, it decided to pour down, so in the 5 minutes it too me to walk from the cablecar to my first lecture, I got soaked. This would have been fine if my coat was waterproof, but it isn't, so it soaked through, my t-shirt was wet also, so I had to sit through a 2 hour lecture in a cold theatre in a wet shirt. And my coat still isn't dry, and I have to put it back on in another 40 minutes to head to my tutorial, then down into the city to get my train pass from my mums work.
I can't wait to get home, put on my fat pants and a hoodie and curl up with a cup of tea and Treasure Island.