I have two golf-clubs, a putter and a pitching wedge. Which I could probably wedge somewhere unpleasant.
Also, a steel-tipped hiking staff, several gaming books, a 20kg tower unit (only in extreme cases!), lots of long cables, three knives, a Bunsen burner, a large and above all ANGULAR model of a Spartan helmet, cast in bronze, and several heavy yet movable shelving units. And a table leg. I have a table leg in my room, unattached to anything, which is kinda long and pretty heavy. And, of course, several wooden chess sets.
Oh, and the stairs, which are right in front of my room, and rather narrow. Something traveling down them really fast would probably smash straight through the glass at the bottom.
I could probably sacrifice Anima or a bust of Socrates. The former is a book weighing just over 2kgs. The latter weighs a few hundred grams, but is pretty hard.