A blonde walks up to a soda machine and a man walks up right behind her. The 
blonde studies the machine then puts in 50 cents, presses, 'Coke', and a coke 
drops out.

She sits it down and begins to study the machine again.

She puts in 50 cents, presses, 'Dr. Pepper', and a Dr. Pepper drops out.  She 
sits it down and begins to study the machine again.

While a little annoyed, the man behind says nothing.
 
She puts in 50 cents, presses, '7-Up', a 7-Up drops out, and she begins to 
study the machine again.

At this point, the man behind her says, "EXCUSE ME, but are you finished with 
this machine?"

She turns and says in her most indignant voice, "Duh, I'm still winning."