At least you have lights at your registers! We don't - we just have a small sign that says "Next lane please" that we put on our belt. We're supposed to get lights soon though.
One asshole walked up to my lane, I told him "Sorry sir I'm closing after I'm done with this customer", he then picked up the sign, put it on the floor, and started unloading on the belt. He just laughed when I asked him what he thought he was doing, and of course people started jumping into my lane as soon as he did that. I got the sign back on the belt real quick, yet another lady ignored it and started unloading on the belt, and I told her I was closed - and she said "What, you're not going to serve me?". Bitch, just for that I'm going to go as slow as humanly possible with the first asshole. I think I hit 4 or 5 items per minute on both transactions.
Right now our credit card readers are prompting for a phone number, and they refuse to read a card until you enter a number or hit the cancel button (yes, it's retarded). In big, bold letters it says "Enter phone number. WARNING: DO NOT ENTER PIN!!" and even has a picture of a phone on the screen. I always tell people "Before you slide your card, you'll need to press cancel" - half of them ignore me and slide it anyway then look at me with a deer in the headlights look when it doesn't ask them what kind of card it is. One of them slid it after I told him that, smirked, and tried to argue with me saying it was asking for his PIN and told me I didn't know what I was talking about - I pointed directly at the text that said "WARNING: DO NOT ENTER PIN!!" and just stared at him like he was an idiot.