I have a box of knives under my work bench. knives I just never use any more, beat up old Moras, Pakistani knives, retired kitchen knives, etc.
I generally use them for every terrible, rotten, vile, Heinous task I can find. Sometimes I do have fun at the grinder with them. I have one or two in reach at all times. It's kinda handy, really.
Once they aint mo more fun I throw it in the dumpster. (duct taped blade, if it's still left) Or donate it to charity. My last trip I gave 'em half a dozen beat up old kitchen knives and China specials. The guy taking the donation was looking at me and acting like I'd just handed over my wifes jewelry box or something.