There is a few thing I think of when I hear McDonald. Most of them involves greasy junk food, apple pies filled with lava hot goop, and having to pay out large amounts of money for serving coffee that was way too warm in a container with an improperly secured lid to old ladies. The one thing that I don’t think about when I head McDonald is razors.

As some of you might already know, the double edged blade we know and love today is not strictly speaking a Gillette invention. The whole Probak-Gillette story is complicated – as I’ve touched on six years ago and others have explained way better than me – but the long and the short is that AutoStrop Safety Razor (who owned the Probak brand) got ahead of Gillette Safety Razor Company in a patent war over slotted blades, and then negotiated a deal which saw them both being bought out by Gillette and taking over the Gillette board. As I said, it is complicated. But somewhere in the middle of it all, after the patents were filed but before Gaisman ended up in control of Gillette, Probak put out an advertisement suggesting that you – as a shaver – should be the judge of what blades were the better.