always run into weird customers. e.g., they got coupons get some discount on the spendings when certain dollar values are purchases in total; however, there are items exclude from counting in and those items are already listed on the coupons. However, some people still want to agrue with you and try to get those excluded items to be count in so that they can use the coupons...sigh**
My wife is working at bubble tea store and she sometimes ran into customer who said he/she forget to bring the stamp card and he/she should already have enough to qualify for free drinks...