Two Brain Cells- one is dead

Here I was today- working the express lane, and a dumbass comes up and asks
"Is this 15 items ?"
I respond "Did you count it ?"
After she pays, I turn to the next customer, then turn back around to see that the previous dummy had left- without her groceries.
A few minutes later she returns and asks "Was I supposed to put my groceries in the basket myself ?"
( I'm thinking You paid for it dumbass, do whatever you want with it )