How to ask for a totally "RANDOM" girl's number when your downtown??

i go downtown all the time in the summer and spring with my friends, mainly to skate but to just have a good time. sometimes when were skating somewhere, we'll go right past 2 or 3 chicks and I've always wanted to ask one of them for there number (or even both girls). so I always thought it's weird to ask random chicks on the street for there number... right?

so what do I do to get a random girls number?
How to ask for a totally "RANDOM" girl's number when your downtown??
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