Another blond joke!

So a beautiful blond goes to Las Vegas. She was in a casino for about an hour, and realized she was thirsty. She goes to a pop machine and slips $1 in an a Coke comes out. Smiling, she puts another $1 in and another Coke comes out. Jumping up and down she tries again and puts another $1 in and another Coke comes out.

A man, confused, asks her: "What are you doing?"

And the blond rolls her eyes. "Duh!! I'm winning!"