"Most embarrased." Well, I certainly own some crap.
It's kind of a tossup. I have a pot-metal decorator halberd from Denix, that isn't actually a bad example of what it is (a completely absolutely worthless wallhanger), but I can't believe what I spent on it - it was one of those "now or never" things, and I cannot believe I opened my wallet.
On the other hand that was something like ten years ago, and I can pretend I was young and naive. But I have fine knives by the impeccable brand "China, Stainless" - an outfit so stellar that other companies' designers let them use their designs for no payment at all

- that I've actually bought in the last half dozen years. Dirt, dirt cheap, but I bought them, and I bought them not only knowing they were knockoffs, but because they were knockoffs. Now THAT's embarrassing.
I have two kinds of these. One are knives I'm not sure I want enough to want to own them, but that intrigue me enough that I'll pop $1 plus shipping on Ebay to handle the design. (Man, this IS embarrassing.) Then if I actually like it, I'll drop the moolah on a real one. The other kind is that I wanted to see just how bad a dirt-cheap Axis lock could be, and the answer is pretty bad.
I notice Rolling Locks depend on close enough tolerances that I've never seen an attempted knockoff.