A Skinny Black Cappuccino

The following conversation took place in a restaurant in Durban:


Customer: Can I have decaf cappuccino please?


Waiter: OK. Do you want a white cappuccino or a black cappuccino?


Customer: Ummm... what is a white cappuccino and what is a black cappuccino?


Waiter: A white cappuccino has milk, a black one doesn't...


Customer: (perplexed) Don't all cappuccinos have some form of milk in it?


Waiter: (silent) 


Customer: (Pages through the menu to have a look at the hot beverages page) Ohhhh! You mean a white chocolate cappuccino and a dark chocolate cappuccino .


Waiter: Yes.


Customer: I'll still have a regular decaf cappuccino thanks.


Waiter: OK.


(A little while later the waiter brings the beverages to the table and leaves)


Customer (to her friend): This is a dark chocolate cappuccino ... guess I look like a black  cappuccino kind of girl...


(Customer leaves the waiter a VERY large tip in the hope that she will use the money to buy herself a clue.)


That's all.