For many months (maybe not that long, but for several weeks at least), I've been driving with the "check engine" light on. After going to the garage and receiving only a "random misfire" diagnosis from the sophisticated computer equipment, and only expensive educated guesses (ignition coil?) to go one, I thought I'd drive the car until something really wrong happened and we could identify the problem more conclusively.
Finally, the engine light started blinking! And a chime dinged once. But I wasn't sure if that was better or worse. I called the garage but they were busy rebuilding someone else's transmission and couldn't fit me in (hopefully, they wouldn't have to do the same for me). Eventually, I got in and was told the car wasn't driveable ... whoops ... but in a couple days' time we were back on the road with a new ignition coil.
I never appreciated before how smooth a ride is without the jittery, sputtering, start/stop, herky-jerking of the engine. Or how sleek and high-functioning a dashboard can look without amber warning lights. Vroom vroom!