My three biggest problems from when I worked in a grocery store deli:
1) Order one item, then take off/talk on the phone. Since you are not around, I help another custy. Then they demand that I stop since they were there first. You left the line. I learned in elementary school to go to the back if I did that. How did you fail that one?
2) Everybody who ordered this stuff made a point to comment that, "Me/spouse/kids are allergic to yellow cheese, give me the White American cheese with the holes."
Me: "You mean swiss?"
Custy: "No! White American cheese with the holes! Not the cheese from the Swiss!"
3) Custys that wouldn't reach up to the counter and wanted me to walk around to give them their food.
But it was amazing that as soon as my back was turned, they would stand up to reach the free samples.
Don't you realize all that stainless steel makes it easy for me to know what you are doing?