Stolen from the comment section

Gandalf smokes the rest.

Little known fact: All of the accumulated ash from his pipe smoking is the real reason why he's called Gandalf the Gray.

It's a reference to the copypasta "despite making up only 13% of the population" which is used to parody people who post racial statistics (more often than not about people of colour). Also Ben and Jerry's got in on it for some reason?https://twitter.com/benandjerrys/status/972295894484897793?lang=en

Thanks. Sorry I ate one of your arms that one time :(