Customer said I rang up something twice, and asked me to review the order before they pay. I told them I don't think I scanned anything twice. But, I turned the screen to show them, and then they touched it... which I'm now completely regretting doing as that was obviously a bad idea. I didn't expect them to touch the screen. The screen I'm talking about is the one that controls the register, not the one that's above that displays recently scanned items.
What a stupid thing I did. I almost wanted to tell them "Hey! don't touch the screen" but then I immediately thought to myself "Well, dumbass why did you just turn the screen to show them?!!!" I will NEVER do that again...