Just a short rant here, and it's not about medical patients ;)
I like the U-Scan lanes at my 24-hour Kroger because I can usually self-serve faster than the regular lanes (and I don't have to wait on people using checks! :P) I know a lot of people hate them, but that's another argument best suited for GD.
This is more about how the people in line behind you seem to think that as soon as you're away from the scanner, it's their turn to begin. It doesn't seem to matter to them that the system still hasn't reset itself in order to serve another customer. No, they're in even more of a hurry than you are and they're going to go ahead and try to scan their case of beer while you're still picking up your receipt and cash-back. I had to tell the two women behind me doing just that to wait until I was done. They seemed apologetic, but I'd bet they were pissed at me for telling them to wait.
It's not just the U-Scan, either. I've had people almost shove me out of the way at the regular registers even before the cashier has handed over my receipt. It's not going to make their service any faster. Can't they just hold back a few seconds until the other person is done?
And if that's not enough of an example of this omnipresent impatience we all have to put up with, on the way home I watched someone hardly waiting for the car turning in front of them before they had to get out into the intersection, too (divided-road turn onto another street; dickweed waiting on the cross-street.) So, dickweed decides it's not good enough at a time of night when there's almost literally no other neighborhood traffic that he (or she) just can't stand the wait and pulls out while the other one is still in front of them, swerving to the right around their bumper in order to then make a left. I know there's nothing that can be done about that, short of the full automation of all vehicles. I just find it another example of the idiocy of impatience.
:rant:
I'm going to go make frozen margaritas now and "relax"