My current bugbear with QR codes is that lots of folks have started putting their company logo in the middle of the code.
Sure it still works but it makes the error correction work harder so your users need to be nearer or have better cameras than they would otherwise. Annoying.
Whether this joke makes sense depends on how you pronounce Nisan. Some places pronounce it ‘nee-san’ similar to ‘knees and’. Other places province it ‘ni-san’ with the ni as is nickel, and the joke doesn’t really work.