You ask them to sit by you.
You go sit by them.
You sit next to the person and tell them a joke.
You buy the soda five days in advance.
You buy the soda at the last minute, and decorate it with smily faces.
You and your friend go buy soda together for the party.
You make a joke about it.
You tell them it is not nice to cut in line, but ask if they want to play ball after lunch.
You tell the lunch lady right away, someone is breaking the rules.
Say hi to everyone, even if you do not know them.
You pretend to trip, to make your friend laugh.
You hurry to class, you do not want to be late.
You say, "Backwards is the new style!"
You say, "hey it is OK, we all do that sometimes."
You say, "I can help you color code your outfits so that does not happen."