In halls all of us bar one left early for Easter holidays, he stayed on for a week extra. The one left behind proceeded to use all our crockery, saucepans and cutlery before heading off for Easter himself, but proceeded to hide all the dirty stuff in everyone's cupboards before we went. 3 weeks later I return with my parents to find mouldy encrusted food covering everything. We had a huge bath in halls, we had to soak everything in there for a day before we could wash it.
He turned up to uni with £100 of grot mags, apparently he and a mate had a competition to see who could spend £100 on it first. He decided to throw it all when he got a gf. He nearly sparked a riot with blokes rifling through the big bins looking for his stash.
Run out of dishwasher tablets, so a group decision was made that washing up liquid in the washer would do the trick instead.....
Same person as above on a night out got so drunk they wouldn't let him into a club. He had an argument with his girlfriend as she wanted to stay out and stormed off. Instead of going home to ours he let himself into her house and decided to stage a dirty protest, discovered by one of the 7 girls she shared with. I get in from a lecture the next day, bold as brass he told me exactly what he'd done and said "I've still got some sh!t between my toes".
Same person again.... always drew the short straw on the bedroom pick and had got the downstairs rooms. So he didn't have to trail round the house in the night to go for a pee he used to do it in a lemonade bottle and empty it every morning. His gf would use it too if she stayed over.
On leaving uni I had the same person staying with me for a while (despite being filthy he's a top bloke) in a new flat. My gf at the time got in from work to find him sat at my PC with his trousers round his ankles apparently the flat was "too hot". he also had an obsession with Lindsay Dawn McKenzie.