right this is just being created and hasn't been tested but let me know what you think , you have to be cocky funny for this to work.
in a club a set is stood by the bar waiting to be served, approach the set from a side, barge in front of them and grab the barman/woman's attention to get a drink, hopefully if one of the set says anything before the bartender gets to you ie :

Her: hey we where here first, get in line!
You: oh im sorry, i didn't realize madam was old enough to drink, im sure you'll get id here. but if your real nice is sure your friends will buy you a drink
Her: hey! im old enough
You: really! (shocked) you look _____ (trick is to guess close to her age but younger IE is she looks 20-ish say 17, 2 - 3 years, is what you want to be guessing)
Her: haahaa im actually _____
You: Wow!, Really that's cool, i would never of guessed. (trick is to act really excited about it, it's the weirdest thing to get excited about) i have to go and tell my mates i was wrong, see im a magician (if you want to do a magic trick) and i usually can guess these things, like i can revile the darkest secrets about people i have never met before and tell them things about there personallity that they don't know themselves
come over here and i'll show you

tell me what you think
im off its a Saturday!

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Mindless

Not bad. Probably would want to make sure your voice inflection and posture is not to threatening though or else you might get slapped.

If it's true that attraction and picking up women is largely about value, then wouldn't it follow that what you say is of far less importance than who you *are (*to her)?

You could say the greatest line in the world as someone perceived as a weak, low-value idiot and get nothing in return; conversly you could say the worst line as someone perceived as a star and reap huge benefits.

--- But yeah, as an average guy in an average setting that line doesn't seem too bad at all.