that's actually a good opener within itself

Goes like this:
Hey guys, I need a female opinion about something VERY IMPORTANT (smile and pause): when a guy gets a phone number of a girl he just met, should he call or should he text?
And then you can play it devil's advocate regardless of what they say. Works almost every time. Good for a cold approach or as a routine when conversation stales.
Used to be my to-go opener before I transitioned more into direct/natural game. Still use it every now and then. Also provides good insight

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