You know when you're expecting people to arrive? Family, specifically. You're bustling around, changing beds and hoovering up random filth, making the place look lovely for them.
You decide to go out into the garden, put the benches and deckchairs out ready to relax out there later on. While you're out there, you might think "I know, I'll sweep up all the grass clippings all over the paths so that it looks really tidy, and people won't trail grass all through my freshly-hoovered house.
You fetch the broom, and set to, sweeping cheerfully in the sunshine.
You hear a shrill "Coo-eeee!" from around the front of the house.
"Oh good," you think. "My guests are here nice and early. Hurrah."
"Coo-eeee!" you reply, continuing to sweep.
"Cooooooo-eeeeeeeeeeeeeeeeeeee!" comes the call again, louder and shriller.
"Helloooooooo!" you reply, still not stopping sweeping, waiting for your guests to appear round the corner into the back garden.
They don't appear.
You realise that they are playing games with you; their shrill calls take on a strangely urgent tone.
"Is there a cat in my front garden? I can hear it mewling and squawking at me," you call, as you walk round the corner.
You come face to face, not with your sister and her family, but with the post lady.
"Oh! I was expecting my sister! Um...sorry."
"Here's your post. I knew you must be about, I could hear you sweeping."