My 11yo is somehow deeply convinced that all the clocks in our house are wrong and all of us are playing a trick on us. He is very vocal about this.

He has now convinced the 7yo that to assert that 11yo is right and it is 8:01am rather than 8:01pm. I am impressed.

Final report: 11yo apologized in the morning. Appeared to be sincere about having been fooled the previous night.