Chocolate bars, cans of motor oil and thermos flasks - all seemed perfectly innocuous during the war years but newly-discovered drawings from the time have revealed that all could hide nasty secrets.
Hand-drawn images of ingenious WW2 boobytrap bombs have been discovered 70 years after they were first produced, showing some of the ways British forces believed the Germans were trying to plant bombs to harm them.
According to the BBC, the drawings were commissioned from Laurence Fish by Victor Rothschild from MI5’s counter-sabotage.
The drawings were intended to show how such devices could be recognised and defused.
Perhaps the most daring is the exploding chocolate bar, stamped with the Peter’s brand.
The idea was that when a piece was snapped off, it would pull a hidden piece of canvas and causing the bomb to detonate after a seven-second delay.
According to the BBC, this was rumoured to be intended for use in an assassination attempt on Winston Churchill.
Historian Nigel West told the BBC: "The Germans during the Second World War were very keen on destroying ships and their cargoes leaving neutral ports for the United Kingdom.
"The idea was to starve Britain into submission. And they created some very ingenious devices which could be smuggled aboard ships and placed in the cargo holds with long-term timers: they wanted the ships to catch fire or to sink whilst out at sea."
Fish went on to become a commercial artist after the war, producing work for well-known brands including Dunlop and BP.
While a few of the drawings were kept following the war, most of them disappeared.
It was only a few weeks ago, when members of the Rothschild family were clearing out their Suffolk home, that the images were rediscovered hidden in a chest of drawers.