A BeOS bug story similar to the phase of the Moon:

  Two [BeOS] test engineers were in a crunch. The floppy drive they were currently
  testing would work all day while they ran a variety of stress tests, but the
  exact same tests would run for only eight hours at night.

  After a few days of double-checking the hardware, the testing procedure, and the
  recording devices, they decided to stay the night and watch what happened. For
  eight hours they stared at the floppy drive and drank espresso. The long dark
  night slowly turned into day and the sun shone in the window. The angled sunlight
  triggered the write-protection mechanism, which caused a write failure. A new
  casing was designed and the problem was solved.

https://www.haiku-os.org/legacy-docs/benewsletter/Issue4-22....