Go to Google and search for [spinner] and Google will give you an interactive fidget spinner. Just when you thought the craze was over, Google comes out with this easter egg to drive some more awareness to the madness.
Here is my poor and rushed attempt at an animated GIF of it in action on Google:
Anyone who has any kids between the ages of 5 and 18 probably have at least one of these in their homes.
This feature reminds me of the flip a coin and roll your dice among other Google easter eggs.
Forum discussion at Twitter.