I was at a bar last night and it worked on 6/6 girls. I'm sure it isn't foolproof and depends how smooth/good looking you are, but here it is.
Walk up to a girl, buy her a drink, and make small talk for a few minutes. If she seems into it and you're making her smile/laugh, ask to draw her something. On a piece of paper/napkin, draw:
(_ _ _) _ _ _ -_ _ _ _
Then say the drawing came out well but you need her to finish it for you. Hand it to her upside down and give a witty smile. I got some great laughs and 6 numbers to choose from.
Happy hunting :p
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I got a good pickup line: [spoiler]Baby I wish I was your derivative so I could lie tangent to your curves[/spoiler] [spoiler];)[/spoiler] [spoiler]_ _ _ -_ _ _ -_ _ _ _[/spoiler] [spoiler]| ̄ ̄ ̄ ̄ ̄ ̄| | Dm Me I'm | | Desperate | |__________| (\__/) || (•ㅅ•) || / づ[/spoiler]