Or, an "empty" shell you've had on the side of the bath for months finds a way UP THE BATHROOM WALL one night and delights and frights and delights you in equal measure when you wake up to see this:
My other half: "Do you think it was always in there or has another thing moved into it?"
I was tempted to leave it, just to see how far it might travel over the next few nights, but thoughts of it being hungry and probably not wanting to live on a bathroom tile took over. Also we're not allowed pets in out flat.
So we gently removed it from the wall to see the creature had retreated back in the depths of the shell, but some kind of special glue had kept it aloft all the other stones, a la Karen Jones' brilliant interpretation of the pic on Facebook: A leader emerges. The stone people - and two potatoes - gather around and await their orders. The battle plan will be put into action soon. Death to the captors!
But we quickly silenced the shell creature and transported it back into the wilderness, well - a nearby posh garden.
Bon chance, petit escargot.