While under German occupation during World War II, the French car company Citroën continued to produce trucks. But it had to do so for the hated enemy armies.
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In response, Pierre-Jules Boulanger, the president of Citroën, found a brilliant and subtle way to sabotage those trucks.
He had factory workers move the engine oil indicator notch on the dipstick down just a little bit. Jalopnik explains:
By moving the notch down, the trucks would not have enough oil, but German mechanics would have no idea, because, hey, they little notch on the dipstick says its just fine. Then, after the truck has been used for a while and is out deployed somewhere crucial, whammo, the engine seizes up, and you’ve got a lot of angry, stranded, vulnerable Nazis, balling up their little fists and redly barking curses in German.
Photos: TycoonX and Dvortygirl
Source: neatorama