The Backwards Bloon is a red Bloon, that when popped, contains a Blue Bloon. The Bloon will continue ranking up when popped, and if it's hit enough, it becomes a new OP blimp that is immune to everything, even OP Towers and OP agents. It will stay in place for 2 seconds, and a speech bubble will pop up above it showing a Trollface. It will then rush to the end at 10 times the speed of a speedy Game Over Bloon, making you instantly lose the current game, and the next 9001 games you start.
Note that this is a joke conception, and is for entertainment purposes only.