In the pub in North Wales one rainy lunchtime. Two friends enter, soaked to the skin, having run over Cadair Idris. Roger’s car is parked up at Idris Gates carpark, about 5 miles away. Drinks are drunk, time passes.
Then Barry enters, he’s ridden his bike from Tywyn, about 10 miles away. Roger persuades Barry to collect his car for him, to save the walk/ run in the horrible weather. Barry agrees, takes the keys and cycles up to Idris Gates to collect the car, a White Sierra 4×4. He drives this back to the pub in Abergynolwyn, having dried himself off with the towel first and then put his bike in the boot.
Roger realises that this is not his car, it is some random stranger’s car- so they all set off back to the carpark to collect the correct Sierra.
What the owner thought we never knew. Everything was left as it was found- except a warm engine and a wet towel.