way back in my college days, i would:
squeese out a pak of mayo into a condom, slip it over the house mother's apt door,
thickly apply vaseline to the door knobs of my dorm buddie's rooms,
tightly wrap the toilet seat in the dorm lobby's bathroom with saran wrap, unscrew the lightbulb and TRY to keep an innocent look on my face when the screams/bellow/cursing erupting in that dark, damp room.
"clean" the windshield of my hated professor's cars with a linseed oil soaked paper towel.