Ordering a Burger at a Taco Joint... Srsly?

Every once in a while, we'll get a customer who tries to order from another fast food chain. 2% of the time, they're serious. Most of them think that we have coffee or some kind of cold dessert or shake, but we don't. And the other 98% just think they're funny. And you can tell, because you hear them all giggling in the car.


Me:"Hi, Welcome to *insert restaurant name here*. What can I get for you?"


Customer: "Yeah, I'd like a Whopper with cheese." *friends snickering behind in the back seat*


Me:

Some-distant-voice talking to driver: "Dude ask her for some fries."


Some-other-distant-voice: "And a shake!"


Customer to other people in the car while laughing: "Dude shut up!"


Me: "Sorry, could you repeat that?"


Customer while laughing: "Can I get a Whopper with cheese and fries."


Me: 

Me: "Sorry sir... Our burger sale ended last week. We're only selling tacos now."


Customer & passengers laughing: "Ohokay.  You guys suck!!" Drives off.


Me: