And then there's my particular favourite - people who don't queue at all.
I was in H&M today - trying to buy white tights for a sodding angel costume when every other bloody parent in Somerset has clearly got there first, but that's a whole other rant - and they have those queue barrier things, with big QUEUE HERE signs. So I was obediently queuing here, with a whole load of other obedient queuing-here types behind me, when a lady, presumably with her mother, came up to the side of the tills, looked straight at the queue, and then loitered, looking shifty.
Sure enough, a till became free and she made a sideways dive for it. I was only about two steps away, so got there first, and she actually tutted at me and retreated, muttering "oh don't mind me."
The bloke behind me said loudly "No, because there's a QUEUE."
Both ladies pretended not to hear. He said, more loudly, "Did you hear me? About the QUEUE?"
She muttered something about not having noticed and sidled off, looking annoyed.
I think I'd object less to queue jumpers if they would just say "it's a fair cop" when challenged, rather than trying to make out that they're the wronged party!