Well it all depends on genders, how close you are, and your friend's personality
With my small handful of friends one is always sad due to home issues so to cheer him up I just play small games that mean the world to us and we pass a post-it note with writing on it in class we pass them read them and erase and write our note we are quite close and oppisite genders.
The other ones are rarely sad so we just sit in a circle playing silly roleplaying games when we are together
