Do it yourself checkout.
Did you ever go to the supermarket and use on of those computerized checkouts? I use them when I only have a couple of items to checkout.
Today I had Super Glue and orange juice (weird combination, huh).
So I get to the checkout and the computer says "Please scan club card".
I do this, and then the computer says "Please scan first item" I scan the Super Glue, the computer says "Please place item on the conveyor". I do this. Immediately the conveyor reverses and the computer says "Please
place item on conveyor, credit $2.19". So now I go through the whole routine again,this time the computer says "Please place item on conveyor", I do this and immediately the conveyor reverses and the computer says "Please place item on conveyor, credit $2.19", This time I scan the Super Glue and I don't put it on the conveyor (I figured it was too light to register on the conveyor) and the computer says "Please place item on conveyor" but instead of placing the Super Glue on the conveyor, I scan the orange juice and put that on the conveyor. The computer liked that idea.
The computer says "Please select method of payment", I select cash and the computer says "Please deposit cash to the left of the scanner"
at which point I say "PLEASE SHUT UP ALREADY'.