So, many years ago, before I joined the Army, I worked in the produce department of a grocery store. I had a lot of good times there. It was a great place to play jokes and have them played on me... But here's a story from my time there.
I was out restocking some fruit or veggie when an old man came up to me and said that he only wanted half a head of lettuce. Now, I was used to requests from customers, even slightly odd ones, but this one really bothered me. You see, that week, our best sale item was lettuce. We were selling oversized heads of lettuce (24 to a case, not the usual 30 or 36 per case size) for only 19 cents a head. We were undercutting all of our local competition by 30 cents a head AND we were selling larger than normal sized heads.
I took the lettuce from the man, not managing to entirely conceal my ire and went to the back room. When I got through the doors, I said to my manager, "Can you believe that some JackA$$ wants half a head a lettuce!"
My manager's eyes went wide and I realized that I hadn't heard the door close behind me. I slowly turned and saw the old man standing in the doorway.
Thinking quickly, I added, "And this kind gentleman has graciously offered to buy the other half."
Is your BS-ometer going off? It should be. This was one of my favorite stories for new guys that came to work in the department. It was great when I could actually get people to fall for it. If they did, I usually followed it up with another more blatantly false story to try and let them off the hook... I'll put that one up at a later time...