Three women walk into a bar: a brunette, a redhead, and a blonde.

The brunette says to the bartender, "Give me a 'BL'."
Bartender: "What's a 'BL'?"
Brunette: "Duh, a Bud Light."

Bartender: (speaking to redhead) "OK, what'll you have?"
Redhead: "Give me a 'ML'."
Bartender: "Let me guess, a Miller Lite?"
Redhead: "Duh, yeah!"

Bartender: "And for you?"
Blonde: "I'll have a 15"
Bartender: "A fifteen, what the hell is that?"
Blonde: "Duh, Seven and 7"