Landmine

Landmines are items that when placed, will blow up on impact. They look like a Stone Pressure Plate, but with a red light on the center. Each batch makes 5, and they can't be reused.

Uses
You can use Landmines to defend your house from trolls, and of course mobs. In multiplayer, they could of course be used as traps. More creative uses can be such as an early warning system, in torture chambers, or playing a game like Spleef, but where you try to place mines under your opponent.