The Mind Controlling Device/Tell the truth.

From Create Your Own Story

You: "You probably won't believe it anyhow, but I got it this morning - from a fucking robot! He was just standing there and told me I should take it. After that he just vanished, but the most awesome thing is this: This thing gives me the ability to control minds! I can pro-"

You hear a weird noise. You look around and suddenly you stare into glowing red eyes. The new guy has rotated his head 180° and is now looking at your watch. A diabolical grin appears on his face as he stands up. He raises his left arm and with a mechanical sound his arm splits open. Inside there is a kind of gun.
A Sylex!, you think and before you can react he shoots you in the face, takes your watch and disappears without a trace.

Five months later the world is taken over by an invasion of Sylex robots who have used the mind controlling device to infiltrate every nation and every army of the world. The human race has no means to defend itself and is enslaved.

The End.