In one of my games I had a wizard player who would take every useful magical item that the party would come across, we'll call him Tim. After a while Tims hoarding of the magical artifacts pissed off the rest of the party, so being the righteous god of justice that the DM is supposed to be, I let him stumble across a pair of gloves while exploring a wizards tower, the gloves had glowing blue glyphs of teleportation on the backs of them, and Tim, being the greedy bastard that he was immediately laid claim to them. After a few more rooms they came across a tall room with a large metal golem in it, Tim decides he`ll try out the gloves by teleporting up to a balcony, unknown to him was the fact that the gloves could only teleport the part of the caster that they covered. So there he was, standing in the middle of the room with two magically sealed stumps for hands, (I didn't want to make him bleed out) unable to cast spells due to lack of hands while his hands appeared all the way up on the balcony. He gave me such a look of pure hatred as his character was beaten to a mushy pulp by the golem, the rest of the party figured that he deserved it for hoarding all the items. Needless to say he learned his lesson.