On the table is a white mushroom with a label attached. It smells just like a white mushroom. The you notice that the table is growing larger and larger still. The white mushroom you're carrying gets heavier and heavier, and you notice that it too is growing. The door in the south wall grows in height, and the room itself seems to expand in every direction.
Platypuses cavort happily on the lawns and in the pools.
Still peering through the keyhole, you see a smiling platypus wearing a party hat waddle over to the door. The key is on the table. The platypus waddles away from the door. The table looms over you like Everest over Hillary. Way overhead, you see a key through the glass, which you're sure wasn't there before.