Here is a story that makes me want to vomit.
I recently experimented with buying Bitcoin, and bought a relatively small amount. Not a huge amount, but enough to be extremely upset if I lost it.
And guess what, I almost did. Because of QR codes.
Read More Here: https://www.lifehacker.com.au/2017/12/if-youre-transferring-bitcoin-be-careful-with-qr-codes/