There's also the version with examples if you want to know exactly what and why it breaks.

And the git that collects all of these in one place, if you want to really nerd out.

Also relevant: https://www.wired.com/2015/11/null/

This is going to be bobby tables isn't it?

Edit: It wasn't?!

Been there, seen that, had to deal with it. Now add the problem that there are people who don't know their birth date or not even the f-ing year they were born in. And I'm not talking about someone from a lost tribe at the Amazonas.