My favorite is getting their attention and staring into their eyes. Eventually they will become uncomfortable, usually asking something along the lines of "Can I help you?" or "What do you want?"
At this point I slowly remove my pocket knife and begin tapping the blade against the palm of my hand while saying "I was just noticing you have beautiful eyes. Can I have them?"
"hi, my stalking offers a wide range of services at a cheap price. would you like quiet staring, jogging on the spot behind you? or breathing down yor neck?"
Hi...uh....I'm not supposed to be talking to ya.... So....ya.....in fact...I'm not!!!.......I'm just that street lamp from over there....don't mind me...... ~~I sit down quietly on the floor and hug my knees while staring pointlessly at the floor~~ By the way!!! U are nasty....doing watt u do at 10:00 pm......every day since may 16 2009...........don't ask...
I would say something, but I myself am being stalked. I was eating in a different lunch wave than what I usually eat in, and from across the room I see somebody looking right at me from across the room, waving at me.
And XVERB: meh... I kinda prefer a black van. It's a lot easier to go out at night when you have a black van with tinted windows.