I'm going to step out on the other side of the cash register for a moment and talk about annoying cashiers. Yes, it's rare, but there are some out there.
One thing I hate is when I'm waiting in line and HAVE been waiting in line for awhile, and the phone rings behind the register. Instead of taking care of the 5 customers in line, some cashiers will answer the phone. I fucking hate that.
If the phone rings while I'm ringing up customers, I will let it ring. Whoever is calling will call back if it's important enough. Usually it's just some asshole calling to get the winning lottery numbers because they are too lazy to check them online or call the hotline.
I get serious road rage when I'm waiting in line and watching a cashier take care of someone over the phone. If you HAVE to answer the phone, put them on hold then.
I think I'll carry a pair of scissors in my purse so that the next time this happens, I can walk right up to the register, past the lines of people waiting, and snip the telephone cord. Maybe then I'll get some good customer service. Either that or handcuffed.