I worked at a niche health food grocery store many years ago that got a fair share of weird customers. The store introduced checkout scanners while I was there;

I worked at a niche health food grocery store many years ago that got a fair share of weird customers. The store introduced checkout scanners while I was there; previously the employee at the register would simply type in the price of each item. Most customers didn't care but a very vocal minority was outraged about how toxic and dangerous the little scanner lights were.