You just don't have room for it in your category schema.

  Does a coin land heads or tails?
  No. Sometimes it lands on its side.

  In a computer, is it always "flip/flop" (0 or 1)?

  No. There's a reality called race conditions. Sometimes it's in
  the middle.

  Sometimes it's both. I live on this planet, not the land of
  fictional thought experiments.