Help me find this website that I should have bookmarked

Hello HN,

Years ago, I came across a website about JavaScript weirdness.

It was structured as a list of exercices with an example of output and you had to come up with the snippet of code to produce that output.

There was stuff like:

  > x === x
  false
  // solution was x = NaN

Or:

  > a == b && b == c && a != c
  true

I can't find the website anymore, I'm wondering if someone here remembers it.