heh... wanna trade roomies? yours sounds nice compared to what mine were doing this semester.... (i've just recently moved into an apartment by myself, so i've fixed my problem)
I was one of 4 people sharing a three-room house that was renting from someone far away, this is what they did over 4 months
Flea shampoo/WD40/who knows what else in my zest/fabric softner
anything of mine left in common areas got placed next to my door at night, so when I woke up it was like ooo delivery (and this was only done with my stuff, they didn't touch the person who was in the third room's stuff when it was out) then they would leave their dirty laundry inside out in the bathroom for days, and put her dirty shoes on the dining room table
my books, placed on my shelf on the common bookshelf in the livingroom, kept getting rearranged
my meds would find themselves in odd positions
items inside my room would get rearranged
they took one of my backpacks (filled with stuff) and stuck it in the shed, i didn't find it until I moved out.. I knew it was missing. I just didn't know where it had gone off to
they took my $400 camera, without asking, and only gave it back when I asked for the SD card (which i had loaned them to use for their PS3)
snapped open my combination bike lock (broke the tumblers)