Way back in the dim distant past I had a lovely Sony cube radio alarm clock. It had a switch on the back to determine the clock speed, either 50 or 60Hz. One day, unbeknowst to me, I, or someone else, moved the switch from 50 to 60Hz.

When the alarm went off the following morning, I proceeded to get ready for lectures (This clock was my only means of telling the time, there were no phones or computers in my room) and after having showered I switched on the TV (which could only receive 3 channels at the time!) where I was met with unfamiliar programmes. This confused me for a long while until I realised the time was about 40 minutes later than the clock told me. I missed my first lecture.