Citation needed

[hrbrmstr]

If anyone has a link to the source from the tweet stream, please drop it here so credit can be given.

[jhollist]

Here's the original tweet: https://twitter.com/vickyyyf/status/845395943365267456

Although don't know the original source.

[hrbrmstr]

I think I found it http://www.pangloss.com/seidel/shake_rule.html