I once left someone's flat and an old drunk guy was stood outside his door on the communal walk way against a 4ft wall looking down at the road whilst having a slash...
I literally had to walk past him so just stood there till he finished, he never said a word and neither did I.
I thought what a dirty old bugger!
A schizophrenic woman lived behind my parents house when I was around 15, apparently when she got evicted or whatever they found her whole attic full of bottles of urine :S
She used to go mental off her meds I guess, shouting at her daughter or attacking her.
I remember she came round one night completely naked asking to use the phone and my mum gave her a towel and let her in lol...
she didn't cause any trouble used the phone and left though, I think she was phoning some mental services or the police.