Shopping mishaps

Don't get me wrong. I love shopping. But when you are stuck with a long line at the check out, you just want to go for those DIY lanes, which are sometimes much shorter. I reckon it is okay for most of the time. But if I get any hassles like when the barcode scanner can't read an item's barcode, it just isn't worth it. You end up seeking assistance from the shop assistant, which makes you regret for not having checked out via the regular ones. So yes you are stuck, and that takes out all the fun in shopping.