Me: “Okay, would you like the cake to say anything?”

Customer: “Like what?”

Me: “Happy Birthday? Happy Tenth Birthday?”

Customer: “Oh! Well, if you could teach it to sing ‘Happy Birthday,’ that would be great!”

(I think the customer is joking, so I write “Happy Birthday” on the cake as usual. Later on, the customer calls in complaining that his cake didn’t sing when the candles were lit!)