Uniqlo's Automated Self-Checkout
wsj.com
wsj.com
I bought some socks and a hat. It ended up duplicating items and not applying the 2-for-1 special, even though I started over a couple of times.
I had to take my stuff to a human counter.
It's understandable for software systems to error-out if things go wrong, but it's really bad when the system happily charges you the wrong price.