Scala would be more fun if it had one of these...

Schrödinger.scala

final case class Schrödinger[+A, +B](private a: => A, private b: => B) extends Either[A, B] {
  private lazy val actual : Either[A, B] = 
    if (new Random().nextBoolean())
      Left(a)
    else
      Right(b)

  def isLeft = actual.isLeft
  def isRight = actual.isRight
  def left = actual.left
  def right = actual.right
}