I've done self-checkout before, I know what's up.
But after quickly scanning all my items and placing them in the bagging area to await transfer into my eco-friendly bag, I snap my card into the reader, pop the correct buttons for "debit," and punch in my PIN... and accidentally hit "cancel."
Which shuts the whole thing down, and now here comes the woman who monitors the self-checkout machines to help the idiots who have trouble figuring out things like scanners and card readers, coming over to me like I'm some kind of help-needing moron.
I curse quietly and get the card back into the reader before she gets to me, and, seeing that I've got the situation under control, she goes back to her bored post, staring off into space at the foot of the aisle.
One year ago: How to Have a Bad Night
Two years ago: Consider the Trees
Three years ago: And So On
Four years ago: See You Around. Or Not. Probably Not.