Schrödinger was a farmer from the vicinity of Tristram who one day began to claim to see cows standing on two legs and carrying large weapons.
Obviously, nobody believed Schrödinger, so he set out to prove that he was telling the truth.
Day after day, week after week, Schrödinger set traps, devised tricks, and even created ingenious boxes to catch the strange cows, but time and time again, he failed.
For some reason, the cows only appeared to him, and were never seen by others, no matter what he tried.
This is why the farmers of Tristram talked (and laughed) for many years about the “Schödinger’s cow”, a cow that exists or doesn’t exist… until you see it.