The Sordonna Sword

Once upon a time, a blacksmith named Kief and a witch named Sordonna got married. As they got into their elder years, the witch constantly nagged the blacksmith, to the point of driving him to homicide. One night while she slept, Kief took one of his best blades and lopped off Sordonna's head. The witch - body, head, and all - vanished in a puff of smoke, and a mysterious second sword grew from the tip of the blade.

At first, Kief was simply glad to be rid of the old witch. He tried to drop the sword, but found he could not! Only moments later, he felt a strange pulsing on top of his head. He rushed to a mirror to see what it was, and was horrified to see a miniature version of Sordonna's head growing from his scalp! Kief ended up chopping off his own hand to be rid of the cursed sword, and threw it into a nearby lake. The little head disappeared as soon as he did so, but the event drove him to insanity and an early death.

The cursed Sordonna Sword has since been discovered and discarded numerous times throughout history. The blade itself is unwieldly and difficult to use, but more problematic is that whoever holds it cannot let go, and so long as his hand grasps the hilt, a tiny head appears on his scalp, staring blankly ahead, but smiling wryly.