Minecart with TNT

A Minecart with TNT is a vehicle which functions as a movable TNT block through the use of a minecart. The TNT can be activated by hitting an Activator Rail. This will start a 4 second fuse. Minecart will explode immediately if it's destroyed by fire, explosion, or destroyed while in motion. It will also explode after derailing and falling more than three blocks.

Uses
Minecarts with TNT can be used for many things. They can be used to help a player remotely mine blocks, through the use of rails and Activator Rails. They can also be used in PVP servers: If someone enters your home, you can send one of these down a rail, and have it explode the player. Another use would be to destroy massive amounts of blocks using the multiple Minecart with TNT glitch, in which the player detonates many TNT carts in the same area, causing a huge crater. NOTE: although this bug was "fixed", it is still possible to create smaller, but still quite large craters using the same technique.

Trivia

 * It was, at one point, possible to create an enormous crater using several Minecart with TNT's and having them all detonate at the same time, in the same space as each other.