In middle school I often had to reset my plugged-in 12-hour alarm clock at night because I would switch plugs for some reason. I noticed a pattern that sometim

In middle school I often had to reset my plugged-in 12-hour alarm clock at night because I would switch plugs for some reason. I noticed a pattern that sometimes my alarm would refuse to ring in the morning but would ring at 8 at night. I eventually noticed that it only happened when I stayed up late and reset the time/alarm at midnight and figured out that my clock was broken because it thought that 11 PM is followed by 12 AM. It was more than a decade until I found out that it was correct.