I knew it immediately too, but only because I'd heard this story or something very like it before. For the same reason, I might quickly figure out a problem rel

I knew it immediately too, but only because I'd heard this story or something very like it before. For the same reason, I might quickly figure out a problem related to janitors and vacuums, or light sensors on the inside of cabinet doors. That's probably the only correlation with being an engineer - not any systematic skill, but exposure to a certain kind of folklore.