Years of owning a smartphone, years of using my clock app for timers, alarms etc and YESTERDAY I realised that the app button on my homescreen shows the actualy time and not just a stylised picture of a clock!
I noticed it and thought "Oh its 4pm and its on 4pm...what a coincidence" in that way you do when the time is 12:34 or 12:21 or whatever. Nothing particularly interesting, you just notice it.
Then a couple of hours later it was showing ten past six....blew my mind!