In my school we have an elevator (really tall building). And every day I have to go to the 7th floor, so it takes a while. So every time I'm in the elevator with a girl (or any person I haven't met for that matter) I'm telling:
"You know, the last time I was in this elevator, red letters appeared on the display, saying: EMERGENCY: Please leave this elevator. But the elevator was still moving, so I couldn't actually leave!"
Most of the time, they are like: So what happened next?! Now I got their attention, you can make up some funny bs story (As Mystery said: It's not lying, it's flirting). By that time I'm already at the 7th floor, so we say to each other: have a nice day.
But she will remember me. It's a great way for me to socialize and meet new people within a minute
In case they don't have elevators at your school:
- ask for directions
- pass notes in class (it's playful)
- make jokes about the teachers (they will always be the center of ridicule anyway)
- ask to borrow simple stuff like a pen or a piece of paper. Make sure you smile and make eye contact when you do. Or "forget" to give her her pen back, so she will have to ask you for it. That way, she initiates contact.
hope this helps