A few months ago some dude offered a very fancy business card: it looked really gorgeous and all tech. Don't remember all the details but it was shiny and had tiny components etc.

So I took it and was going to put me in my wallet and the dude interrupted me and say: "No, no, you can't have it, I've got only one, you need to scan the QR code".

I found that incredibly cheap ; )

P.S: and also I don't scan random QR codes.