I read today that a WW2 'exploding rat' is up for auction (The Times, 30/11/2017). With the stuffing taken out presumably.

It seems this was a cunning 1942 plan by British 'boffins' to undermine German armament production. Agents would smuggle explosive-stuffed rats into munitions factories and inconspicuously leave them by furnaces.

Sooner or later, the idea went, a worker would spot the dead Ratte and exclaim 'In den Ofen damit!'. Rat goes in oven, explodes, whole factory goes up. You get the idea.

But apparently early attempts were intercepted and the project was abandoned. The best-laid plans of rats and men...