Each time he winds them up, another one appears. He winds that one, another one appears.

One by one by one.

Until he finds the one that is a bomb.

[You'll find part of your body exploding. It is about as gross as you'd expect. Flesh and bone are splattering everywhere and the pain is excruciating and your ears are ringing. Slowly, your body tries to regain itself, but too much and it'll explode again in another limb.]