Hippy Christmas, that is. All of the college kids living in the UW campus area move out of their around noon on the 14th and into their new ones around noon on the 15th. (Some don't move, and some don't have the noon-noon wait, but many find themselves homeless overnight.) In the rush, piles of stuff are left on the curbside. Much of it is total crap, but there is a great deal of stuff that is perfectly good, but no one wanted to bother moving. It is a dumpster diver's paradise. (And the city trash collector's nightmare.)
I am very glad that I no longer must face the whole college apartment rigamarole, especially the landlords and the weird rules. They like to make it difficult. I mentioned the noon-noon lease gap that most must face. Add to that the fact that there is very little parking in the Isthmus area, and that U-haul trucks are in such demand for those days that you can usually only reserve them for a few hours at a time. You can't just put your things in a truck, park it somewhere overnight, and then unpack the next day. Somehow everybody manages, but it's a miracle every time.
I always found it to be breakdown-inducing.