Favourite warm up opener of all time:

You have to do this for your wing and it works best with fairly posh girls as they naturally hold out a hand to be shaken..

Tap a girl on the shoulder, when she turns around smile and say 'Have you met ... (Dave or whatever) ' as you direct her to your buddy.

Girl normally goes 'Er no er I haven't..' and looks at your wing who can go straight for some kino hand holding stuff as he launches into some other chat

Leave your buddy to it.

A truly excellent way to force your mates to overcome any approach anxiety..........