What would you do if you fancied someone and both of you were to shy to talk to the other person? How do you make it obvious to him that you fancy him as well?

inappropriate touching

I haven't been single in a very long time, however I still remember that getting eye contact with the object of my desire (no matter how far or close) and barely ever losing it, gets the point across. Not a creepy stare kind of eye contact, but just letting that person know you like to look at them a LOT.

That would work if you're both drunk.

bring up current stuff
eg 'have you seen cloverfield?' or whatever the current stuff is

or
'are you going to xyz gig?'