I was trying to make my own variation of nuclear minecarts, but instead, with a different track and one cart being a normal one, and the other TNT.
To trigger the glitch, build the track I attached a birds-eye view of, and put down a TNT minecart and push it so it starts traveling in circles. Then, stare at one of the powered rails. When the TNT minecart is not riding over it, place a normal minecart there. The to carts should glitch into the same block, but still be traveling peacefully around the track. Then, try to brake one of the non-powered rails when the carts are not there. They should fall off the track, sort of diagonally rotated inside eachother. After about 5 seconds, you should start to get a bit laggy. After around 30 seconds, Minecraft will probably crash. How to detect a failed test: The TNT cart explodes when it falls off the track. IMPORTANT: there is a small chance that the TNT cart will make an unnaturally large crater, but not quite as big as a nuclear minecart.