In this photo. The Kitty is in a room, this room has a single grass block, which is covering a lava source block.
On the side closest to you there is a dispenser with Enderman Eggs.
the box is sealed, so no one can see the cat, the lava, the block, or the Enderman.
By pressing the button, the Enderman is released. He will wander for a random amount of time, after which he will pick up the Block; thus killing the cat.
Since the amount of time is random, then the cat will be alive
and dead at the same time.
Therefore we have a Schrödinger's Cat situation.