I still remember learning a method to fit a duvet cover from the UK television show That's Life. You turn a duvet cover inside out, reach through it to the inside far corners and then grab the corners of the duvet from inside (or is it outside!?!) the cover and shake it over itself.

I was dumbstruck.

I still use the method to this day, and at least twice over the years a partner has seen me changing our bed and accused me of witchcraft.