This has probably been done to death but I'm new here, so bear with me.
What is your favorite moment in the series? For me it's in Lake Laogai when the Gaang is trapped by the Dai Li on a beach and Appa comes out of the sun to (literally) blow the bad guys away. His airbending seems to stir up the dust in my room or something because it gets in my eye.
A close second is in Sozin's Comet 4 when Toph is down to the last seconds of her life when Suki swoops to the rescue on a stolen airship to save her and her boyfriend.