Give them an intense stare that cute but mysterious if you get what I mean. Just don't be creepy. You can also try staring at the floor and slowly raising your eyes, looking at him. When you catch his eye give him a subtle smile.
Haha, bat your eyelashes. It works cause it makes guys feel...powerful I guess. Just don't go crazy with it and make it seem like something is in your eye.
Play with your hair. You can casually flip your hair over your shoulders, twist it then untwist it, tuck it behind your ears, or run your hands through it. Thats one way to get their attention.
Giggle and smile. Guys love it.
When you talk, touch them on their arm or something but don't make it too obvious.
Just barely touch his left shoulder if you reach for something or whisper to him. The left side is linked to the right brain and that is in more tune with the emotions.
Play with your hair or clothing.
When you do get his attention look him in the eyes and then smile. If he smiles back, slowly look down.
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