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A familiar interlock would be the mechanism used to disable a microwave magnetron when the door is in the open position.

Which apparently doesn't work so well, according to radio astronomers :-/

Kinda makes me worry about how many times I've microwaved the meat-n-two-veg just a bit.

Damage to the testicles is caused by the thermal effects of the microwave, so it's likely you would have noticed.