Customer: "Where is your mad cow cheese?"
Me: "Mad cow cheese, ma'am? Do you mean Laughing Cow cheese?"
Customer: "No! Mad cow cheese! Everyone carries it."
(At this point, I'm trying really hard not to laugh even though other customers are. I ask her to follow me and I show her the laughing cow cheese.)
Customer: "Yes! Mad cow cheese!" *takes cheese and continues shopping*
(I walk back to the area I work in, where another regular customer is waiting.)
Another customer: *laughs* "It's okay, you can laugh now."