one of the cutest things a girl ever did to me was awkwardly walk up and hand me a valentines day card and run away blushing. Yeah it was awkward but I could not get her out of my mind all day and I was even pretty hard for part of the drive home. If her number had been in there I sure as hell would have called her.
Most Helpful Girl
Just walk up to him with a smile and hand him a note with your number written in it.