Origin of "pull my finger"?

How did the classic “pull my finger” fart gag get started?

It has been reliably attributed to the Neanderthal Og, who invented it in 38,542 B.C.

But I used to think my uncle invented it.

Didn’t God pull it on Moses as captured by Michaelangelo on the ceiling of the Sistine Chapel?
I not a real religous type, I hope I got the names right.

I have it on good authority that it is based upon the pulling of the lanyard to fire a cannon.

A few weeks ago at the Super Bowl. But with all the crowd noise Justin didn’t hear Janet’s instructions correctly.