Two things: one, I'm that sketchy guy with five things in his arms, moving back and forth behind the checkout lines, looking to see which line is moving (you look at the cashiers just as much as the patrons; you look to avoid that dead-eye'd robot look or the cashier who's gums are flapping like their reading one of my posts in P/R out loud).
Two, to New World Rushman, regarding the comment about "understanding that they are being a Nozzle", there must be a LOT of idiots in grocery stores asking a lot of dumb-ass questions, because while I do not often complain or even involve management, when I do it's 99% of the time a "do you have?" question. More often than not I get that little flash of "okay, idiot, I'll do the hard work of looking past eye level for you". I've actually taken to going to the Service Desk for any questions, because usually that person is in cooperation mode and is at least pleasant if I inadvertently ask a question that turns out to be obvious.