After years of trial and error, we've determined that the simplest way to change the clock in one of the in-built appliances in our kitchen is to kill its elect

After years of trial and error, we've determined that the simplest way to change the clock in one of the in-built appliances in our kitchen is to kill its electrical power completely for a few minutes (by tripping the appropriate MCB in the consumer unit), then powering it back up. When the power is restored, the appliance knows it's experienced a power cut, and asks for the current time. Yes, this is completely ridiculous. No, I don't know why they designed the UI this way.