Since I was in high school, I have had an Old Timer 80T Stockman knife in my right pants pocket. At least I have had one until the one I had got lost. What that means is that I have bought quite a few of the damned things, since I'm now just shy of being 78 years old. I didn't think there was a solution for this problem of losing $25 pocket knives. Turns out that there is, though. The last time I needed a replacement, I turned to eBay, and bought four used ones for about the cost of one new one. It was a good deal, since all of them were in really good condition and I won the auction without spending too much.
But, once I got them in the usual flat rate USPS Priority Mail box, I picked one to carry, and put the other three on a shelf in my basement. About a week later, I found the one I had lost that sent me to eBay. So, I put that one in with the other three spare ones. So, now I had five Schrade Old Timer 80Ts on hand. It wasn't more than a couple months when we decided to buy a different house, so I was cleaning things up and throwing things away, like you do when you're moving. In that process, I found two more 80Ts that I had lost at even earlier times. I added those to my spares, as well. While unpacking after the move, I found another one, that had somehow slipped through a hole in the pocket of a pair of lined jeans and fallen down between the two layers of fabric and lodged near the hem of the jeans. Now, I have 8 80Ts in total, including the one in my right pocket.
What this proves, I'm sure, is that if you put two Schrade Old Timer 80t Stockman knives together in a safe place, they breed and make other ones. I'm certain that's what it is. Now, if I can get 10mm sockets and combo wrenches to breed like that, I can increase my income in retirement by selling those to other people.