When Dad pushed the car off the cliff, the car was completely fixed, despite the fact that Dad had destroyed it earlier.
When Dad finds the coins in the car, there are two of them. A second later there are three of them.
When Dad finds coins in his car, the big coin is copper, and the small one is silver, then at a different view, the big coin is silver, and the small one is copper.
Dad: FIX IT! FIX IT! FIX IT!
Dad: I'll just clean this now... and fix it later.
Dad: Clean it now, fix it later.
Apparently, Dad went through this on many other car-washing Saturdays.