Dungeons & Dragons

D&D has a fine tradition of bizarre, useless magical items. Here's a collection bizarre, slightly useful ones with non-obvious applications:

Sling Bulettes

These smooth stone spheres look like normal ammunition for throwing from a sling. Once launched, they transmute in mid-air into a landshark. It is fully alive, and rather angry about having been freeze-dried and stored in your backpack. It is advisable to leave the area before it is done taking out part of its anger on the target of your sling, as it still has more anger left.

Let's consider how dwarves are portrayed in D&D 4E: Stereotypically short and strong with a penchant for building and craftwork, yet they live above-ground, without any sort of ability to see in the dark, and were once enslaved by the giants. Let's riff off that. Modern dwarves are, in fact, a slave-race bred by giants for manual labor, selecting them for strength, hardiness, and ability to do tedious work (and losing darkvision in the process). They eventually revolted and won their freedom, spreading out into the world.