So much crocheting

I was thinking that I've been 'crocheting like a madman' lately.

Clearly, he's not a madman... Source

But it makes me wonder, what exactly does that mean? Is it any different than crocheting like a 'madwoman'? I must know.

Someday I'll take a break from the hook to post the pictures I've taken...

**Edited to add: As Moriah pointed out, it looks like he is knitting, but if you click on the source link, they describe his work as Tapestry Crochet, a series of slip stitches. Whether or not that is what he is doing in this picture? Who knows.