I just remembered one from my cashiering days (have I ever mentioned how much I HATE cashiering?)
people who buy produce that doesn't have the PLU stickers on it and then stare at me like I'm a moron when I flip the shit over looking for the code. This one guy was giving me a "is this drooling imbecile serious" stare and snaps "THEY'RE ONIONS!!!!!!!!!!!" Wow thanks dude, I have literally never seen an onion before so please be patient with me ╭∩╮
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for real though there's no way I'm going to memorize 10 billion codes with perfect recall...just about the only ones I remember are 4011 for bananas, 4664 for vine tomatoes and 4609 for the big ass garlic