Queuing Up at Costco

So, I'm standing in the return merchandise line at Costco. It's a long line, but moving pretty good. Why is it that some people (aka the guy behind me) think that they need to line up RIGHT behind you? As in, FORGET PERSONAL SPACE, I'M GONNA LITERALLY BREATHE DOWN YOUR NECK because if I do, the line will MOVE QUICKER. So I have this to say to the guy behind me and everyone else who has ever decided to line up within inches of the person in front of them. Back the F*%@ up dude. I promise, the line will move just as fast. Furthermore, if you don't, I'm gonna leave EXTRA space between me and the person in front of me, just to drive you nuts. In fact, I may even let the little old lady with the box of foil (why do you return Reynold's Wrap, anyway? Was it the wrong size?) cut in front of me because it looks like her feet hurt and I'd hate for her to have to wait at the end of the line. WTF?