My least favorite are the types who will ask me to tell me what each individual item rings up as. And then if something was on the $3 rack and it rings up for like, $5 or something because it was put in the wrong place, they FREAK out on me like I did it on purpose or something.
And also the people that want me to get something that's hanging up on the top down for them, so I have to use this really big and obnoxious pole and usually the size they need is all the way in the back so it takes forever. And then when I'm cleaning out the dressing room later, it's sitting in the dressing not even hung up or anything.