I have used "Hey, my friend just died. Now, what do you think...how long should I wait while I sleep with his girlfriend" Most women knew I was joking...somehow, that lines gave me more success than negative reactions...I used some from here http://pickuplinesblog.com/ and women were like "where do you come up with stuff like that!?"
Here's one of my favorites; Walk into a bar and sit down next to a woman. Look at your watch often. If she notices say, "Hey, you know, this is a magic watch." Her- "Really, magic huh...?" You- "Yep...it tells me things. For example, right now it's telling me that you're not wearing any panties..." Her- "Well, your watch is wrong because I am wearing underwear..." You- "Oh, my mistake...it's an hour ahead of time, can I buy you a drink?"