A client of mine was in his TV production studio when lightning struck the building. He could smell that sweet tasting smell of burning electronics. He inspected all of his equipment but couldn't find anything damaged, and all the gear was still fully operational.
That evening they shut everything down and went home for the weekend. On Monday morning they power all the equipment back up, and that sweet tasting smell of burning electronics was back. It made no sense as everything was still operational. He and his team hunted all over the studio for the scent and eventually found that it was emanating from their pretty expensive Yamaha mixing-desk.