The object or bit of information most needed will be least available. The device requiring service or adjustment will be least accessible. In any human eneavor, once you have exhausted all possibilities and failed, there will be one solution, simple, obvious, and highly visible to everyone else. Badness comes in waves. If there is a opinion, facts will be found to support it.
Rich folks get more strokes.
Bodies in motion tend to remain in motion. Bodies at rest tend to remain in bed. Any wire cut to length will be too short. If it's not going to plan, maybe there never was a plan. If Murphy's Law can go wrong, it will.