The boss bought a new anti-theft system - the one with those little puffy white stickers? So we closed Sunday-Monday, got paid overtime for two whole days to put little puffy white stickers on literally everything. We were nearly done when one of us accidentally discovered that if you squish the puffy sticker it doesn't work.

Turns out there are two foil sheets in the sticker - one pillar puts out a high frequency sound that causes those sheets to vibrate and emit a different sound that is picked up by the other pillar. Squish em together they don't vibrate.

We showed that to the boss. He stares at the sticker for what had to have been 45 seconds... looks at each of us. "What do you want to keep that secret to yourself?" Oh, how bout $1/hr raise for all of us? (this was a long time ago, more like $3 now) "Done."