A couple of less direct ones:
'Hi, can I ask you a question? Do you ever get the feeling that going to bars and clubs is ultimately pointless? What I mean is, More and more I can't help get the feeling that what I want is always just before my eyes... How about you?'
'Heya, my friends think I would be good for you'
'Hey, before you get any ideas, lets just be friends'
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