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neoYb TIL Lego used to bury its used molds in the concrete foundations of buildings to prevent them being reused.
GG5G TIL for whatever reason, a German WW2 submarine captain decided not to call the trained technician and tried to operate the complex flush system himself after he had used the lavatory. He flooded the boat, forcing it to surface, where it was promptly spotted by the enemy and bombed out of the water.