If a Minecart with TNT is hit with an arrow, fire charge, egg or snowball that was thrown/shot via a Dispenser, it will crash the game. Doesn't work with splash potions or other items are dropped by the dispenser.
Steps to reproduce
- Place a dispensor facing a TNT minecart (the TNT minecart can be on any rail or not, doesn't matter)
- Place arrows, eggs, fire charge or snowballs into dispensor
- Activate the dispensor any way you like (redstone, button, etc.)
Device used to crash the game here: http://imgur.com/GMgtM8O Simply place Tnt minecart on detector rail to crash game.