For Children: You will need to know the difference between Friday and a fried egg.

It's quite a simple difference, but an important one. Friday comes at the end of the week, whereas a fried egg comes out of a chicken.

Like most things, of course, it isn't quite that simple. The fried egg isn't properly a fried egg until it's been put in a frying pan and fried. This is something you wouldn't do to a Friday, of course, though you might do it on a Friday.

You can also fry eggs on a Thursday, if you like, or on a cooker. It's all rather complicated, but it makes a kind of sense if you think about it for a while.
--Douglas Adams, The Salmon of Doubt (2002)