This giftee actually made eye contact with me across the aisle of the train while he was chatting with a friend. So I went over and conversed a little about where we were from and how the weather's been strange here lately. (Which is totally bizarre city public transportation behavior! You're supposed to ignore everyone.) Then I asked him if I could give him a gift. He agreed, accepted the gift, and asked what it was and why I had picked him. I told him it was a good luck charm and that I thought he had a nice smile. Success!