which just occurred to me, and will now bother me for ages unless I share it.
You may or may not know this little ditty
"Oh dear, what can the matter be?
Three old ladies, stuck in the lavatory.
They were there from Monday to Saturday.
Nobody knew they were there.
They promised to go to tea with the vicar,
They went in together, they thought it was quicker.
How could they know that the lock was a sticker?
And nobody knew they were there."
This is the thought which just occurred to me - if they'd promised to go to tea with the vicar, then surely HE knew they were there, and would have (or ought to have) sent out a search party to look for them?!