Remember this? Three months ago – not that long, and yet a lifetime… Or a different world anyway. Coronavirus was just starting to be A Thing, and there were all the admonishments to WASH YOUR HANDS, and instructions about how to do it. Which many people, even if they were in the habit, were perhaps not as thorough as they ought to be, so, good reminder.
In addition to flawed technique, folks may also fall short by skimping on time – the standard duration metric is singing “Happy Birthday,” but who really wants to do that?! So all sorts of variations came out, and there’s even a website where you can make a poster with lyrics of your choice!