I've been carrying a knife, almost perpetually (see below) since age 7 (over 30 years now.) I have a few.
Found a Gerber folder in the gutter while on my paper route MANY years ago - bad for the previous owner. Lost it myself, somewhere, sometime several years ago.
Had a SAK classic confiscated at the airport leaving SFO shortly after 9-11. Bad.
Several years later, had another one confiscated leaving Maui, on my way back home. Very Bad. Didn't carry anything for 3 years because I was sick of them getting taken.
Now I carry a "Blem" Kershaw Shallot. I've been practicing my sharpening skills, and had a decent (shaving, paper slicing) edge on it. Was preparing the 2500-grit final pass, and dropped it on the concrete garage floor. Big chips between the tip and belly. An hour later, it was completely reprofiled and nearly as sharp. (I don't have a grinder - just water stones and sandpaper/mouse pad.)
A week later, the dog escaped through the rotted-out plywood man-door in my garage door. Trying to clean it up to install a patch, I pulled out the trusty Shallot. Started out well enough, but when I was done the edge was completely rolled over. Reprofiled yet again. It won't shave, but still slices my tomatoes. Looks pleasantly "well used."
Will I ever learn? Nope - I just learned to call the Shallot my Beater Blade, and reserve my Spydies, Benchmades, and Scrapyard for their intended purposes. I don't carry one of the nice ones without the Shallot handy, because I am unwilling (and can't afford) to create a second beater...