Related:

• It's a knockout tournament and anything can happen.
• Where anything can happen, but usually doesn't.
• Anything that can happen will happen, unless your test plan provides for it to happen.
  -- Weinberg's Programming Principle #3...
• Accidents can happen.
• For medium number systems, we can expect that large fluctuations, irregularities, and discrepancy with any theory will occur more or less regularly.
  (This is more succinctly expressed by Murphy: Anything that can happen, will happen....
• If you don't want it to - it CAN happen.
• A bird can fly, but a fly can't bird. -- Tao of Pooh.
• Locksmiths can get into anything.
• Paramedics can revive anything.