Eggplant on check-out operator's face
A friend's in a supermarket to buy aubergines (eggplants).
Callow youth at check-out: "What are they?"
CYAC: (Checks product list for a code) "We don't have them."
Friend: "Well, the fact that I'm standing here with them would indicate otherwise."
CYAC: "Listen, the only things we've got listed under 'O' are oranges."