Related:

• This can't happen: Less clipped variant of {can't happen}. -- The AI Hackers Dictionary
• Accidents can happen.
• If you don't want it to - it CAN happen.
• It's a knockout tournament and anything can happen.
• People can fly. Anything 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....
• Anything that can happen will happen, unless your test plan provides for it to happen.
  -- Weinberg's Programming Principle #3...
• Everything that can happen, does. -- Worf's Law
• Lesbianism: Sh*t can happen lickity slit.