Today again - pissed off customer

I'm at work again, and here's something that happens a lot. I think it has something to do with the 50 missing IQ points, and I forgot to mention it in the other blog. So, I'm standing at register 1 and nobody is at register 2. I'm open at register one, ready to check whoever needs checking. So, this chick walks up to register 2 and sets her stuff down. There's nobody else in the store, just me standing there behind register 1, and her standing there in front of register 2, waiting to be checked. So, I continue to stand there for a few seconds, making sure that what is happening is indeed happening, again. Yup, it is. So, finally, I kind of just 'wave' over at her, holler 'yoo hoo!', and smile, and she looks at me, completely taken aback, as if she has just noticed me standing 3 feet away from her. She gathers her stuff up and moves over to register 1, where she proceeds to look daggers at me. I scan her stuff, she pays, and as her receipt prints, I ask her if she needs it. She just stares more daggers at me. So I ask her again, pulling the receipt out of the machine, 'do you need this?' She just continues to give me an evil, foul look. By this time, I'm wondering if she speaks English, because she hasn't said a word the whole time, and she's Asian. So, I hold the receipt up in front of me and say again, 'Do you need this? Your receipt? Do you want it?' And now she impatiently holds her hand out in front of her, still looking at me like she wishes I was dead, and I give her the receipt and she stalks out of there.

What the fuck? What did I do? Was it because I didn't move over to register 2? Well excuse the F out of me. Sorry you had to physically pick up your bag of chips or Arizona Tea or whatever it was and carry it 3 feet and put it down again so I could scan it. I realize that you must be very tired after that ordeal. Please forgive me for being so callous.

So anyway, I was more amused than anything about this situation. The only thing that ever really pisses me off about work is just being there... not necessarily the stuff that happens there. That's usually pretty amusing or at least interesting.

edit: I just told my brother about this, and his idea was that the lady was embarrassed at being 'lost in space' for a few seconds and me having to snap her out of it. Maybe she saw my 'yoo hoo' as condescending. Who knows. Anyway, some people you just can't please.