Within arm's reach of my computer are sever potentially lethal objects:
barber's scissors (carbon steel, VERY sharp, got em from a friend)
2 swiss army knives (admittedly folded, so not much use)
several very heavy books
wire cutters
a marble plaque (not very heavy, but hard, sharp edges. dropped it on my foot once, and all I'll say is THANK GOD it was not on my toes instead.)
1-foot Zatko ruler (plated steel, waay too sharp edges for a draftsman's tool)
I also have, of course, a handy supply of pens and pencils. anyone who's seen The Bourne Identity knows what I'm talking about. then there's the stapler, which would probably cause more pain than harm, but hey, it's close by!
I also have an umbrella, but it's about as durable as a bundle of twigs.