Sing Katara and zuko sitting in a tree k-i-s-s-i-n-g... wait! she ended up with a twelve year old airbender then run!
Pour cold water over his head and run like... well... aang!
When he sleeps put his hand in cold water.
Make him do the chicken dance.
Taunt him about bieng beaten by a twelve year old.
Make Appa sneeze on him.
Tell him that I (as in me sora) im more loveable than him and im rabid.
Dress him up in katara's clothes and call him a pretty little girl.
Dress him up in sokka's clothes and call him a boomeraang throwing, meat eating,sarcasitc,idiotic pretty boy.
Dress him up in aang's clothes and laugh
Mimic his, "I must find the avatar" speech in an anoying gruff voice.
Give him a long and annoying talk about how he wronged his uncle.
I could do this all night.