Evolution

Previously, on Kerbal Aircraft Expansioneers...

Shit Happens

• Nothing is as easy as it looks.
• Everything takes longer than you think.
• Anything that can go wrong will go wrong.
• If there is a possibility of several things going wrong, the one that will cause the most damage will be the one to go wrong.
  • Corollary: If there is a worse time for something to go wrong, it will happen then.
• If anything simply cannot go wrong, it will anyway.
• If you perceive that there are four possible ways in which a procedure can go wrong, and circumvent these, then a fifth way, unprepared for, will promptly develop.
• Left to themselves, things tend to go from bad to worse.
• If everything seems to be going well, you have obviously overlooked something.
• Nature always sides with the hidden flaw.
• Mother nature is a bitch.
• It is impossible to make anything foolproof because fools are so ingenious.
• Whenever you set out to do something, something else must be done first.
• The Light at the end of the tunnel is only the light of an oncoming train.
  • Corollary: If you see a light in the end of the tunnel, be sure it doesn't sounds like PEEEEWEEEE...

Source.