A blonde, a brunette and a redhead went into a bar and ordered their drinks from the bartender.

Brunette: I'll have a B and C.

Bartender: What is a B and C?

Brunette: Bourbon and Coke.

Redhead: And, I'll have a G and T.

Bartender: What's a G and T?

Redhead: Gin and tonic.

Blonde: I'll have a 15.

Bartender: What's a 15?

Blonde: 7 and 7.