Not something I did, but someone did for me just yesterday that was very nice.
I was driving home through rural-ish Texas and had just stopped at a bakery to get some coffee and absentmindedly left it, along with my wife's favorite water bottle, on the roof of the car when I started to pull out.
Guy in a pickup across the street pulled into the turn lane and stopped in front of me (not a busy road) rolled down his window and pointed over the roof of his car.
I was super confused for a moment, but got the picture and was able to pull off again and grab the water bottle. The coffee was KIA.
Anyway, thanks to that random stranger.
Duke Nukem Forever did ship... Years late and it was a total mess of a decade's worth of gimmick mechanics that killed the franchise, but it did make it out the door.
Still fits as a cautionary tale about switching engines, I just had to double check I didn't hallucinate that game.