*Gasp*

It's a guy! What do we do!?!
You can:
A) Walk up, flirt, hair-flip, laugh at any lame jokes he makes, then discreetly ask him for his phone number in the hopes that he will give you his real number and not the number for the reject hotline.
B) Walk up, flirt, hair-flip, laugh at lame jokes, arm-touch-thing, in the hopes the he will ask you for your phone number (unless it turns out that he's not that great, then you can give him the reject hotline number).
C) Stare at him, whisper with your friends, start going towards him, get scared and back off, go towards him again, then inform him that you and your giggling girlfriends think he has a nice butt. Run back to whatever planet you came from.
As sad as it may sound, there are people who think that C is the answer. I happened to witness a group of these desperadoes when I was working on Monday. I was standing nearby when I noticed some girls staring at one of my co-workers. They stared when he walked into the bathroom, they stared when he came out, started to follow him, saw him go into a room they couldn't, then said: well, he'll have to come out some time. Talk about creepy!
Well, of course I told him! You need to know when there are creepy people checking you out!
Anyway, he was out there later and they.... well, see scenario C. The dude was thoroughly embarrassed and the rest of us witnesses broke into hysterical laughter.
So remember people, if you think C is the answer, at least buy him dinner first (and how could they tell if he had a nice butt, his pants were too loose to really tell).