(I’m putting the salad on a customer’s sandwich.)

Customer: “What’s that black thing on there?”

(I check to see if I’ve put olives on the sandwich by mistake.)

Me: “What black thing?”

Customer: “That big black thing right there!”

(I check again.)

Me: “Erm, that’s the shadow of my hand.”

Customer: “I don’t want that. Take it off!”

Me: *moves hand*

Customer: “That’s better.”