I've owned one (or many more) and often carried one, ever since Dad gave me my first one at 8 yrs old. I'm a fan of the barlow style, and Camillus Cutlery in particular.
I was thinking about the invention of the pocket knife, or folding knife, or at least the early days of them.
Imagine how men must have found them to be the best thing since sliced bread. Did they have sliced bread back then? Prior to the folder, nothing but belt knives. Big, useless for small work. I'd have been giddy to get a new folder. Oops- I am giddy when I get a new folder.