Smoke-induced aphasia......
Many years ago I was debugging a very expensive bit of electronic kit with a few design issues on one particular board. eg under-specced ceramic wirewound resistor that gave an instant blister burn when lightly touched, and could melt its solder attachment to board. All hinting that a hefty power supply was lurking behind the scenes. Cue a more senior work colleague rushing through a revision and with a flourish hits the "on" button. My slow brain was registering that such haste was possibly not appropriate. The lights appeared to come up, but a few seconds later the magic smoke fairy emerges from a transistor can: actually probably more than one fairy. Although I was the first to observe it, the words of alarm froze in the brain. The only "f"-word was "aphasia".