Would have to be the person who put their washing out.
A whole line full of washing. On New Year's Day. It was pissing down. Now I don't know if it was some sort of OCD issue, or related to some kind of superstition (I have heard of people who have to clean the entire house on NYE to keep the bad karma out. Tinfoil over all the windows is probably less stressful and more amusing for the neighbours), or just someone doing the washing as a way of taking his/her mind off his/her hangover.
Actually, given that there was quite a lot of bedding on that line, maybe someone got so drunk s/he wet the bed, so maybe it was some kind of penitential laundry project.