Yesterday's weather report.
If you looked out the window it was fine.
If you thought about going out, it turned overcast.
If you put on your coat and ventured to the front door, it rained.
If you thought "I'll be OK, I've got a good waterproof jacket", it rained harder.
If you ventured down the road, it rained torrentially.
If you went back inside, it stopped.
If you thought about going out later, the cycle repeated itself.
If you abandoned all hope of getting those parcels to the post office that day, it brightened up.