Batman makes Robin to paint one of his city apartments yellow. The boy complains, but finishes the mess in no time. Including himself and Batman.
In this yellow-ish area they meet Green Lantern then, who just wants to talk and warn Batman, but the Bat only makes fun of him, Wonderwoman, Superman and the others, while indulding himself with lemonade.
Robin joins the convo with come icecream and then they start making fun of Green Lantern together.
Hal gets mad and punches Batsy, who doesn't defend himself. Then Hal assumes that Robin is Dick, but they manage to fool him again, even if he's still suspicious.
And during all the talk and making fun of "Mr Green Jeans", Robin manages to steel his ring. When Batman points it out and Hal wants it back, Robin starts to beat the living crap out of him - until he crashes his trachea. Batman beats Robin and saves Green Lanterns life, while taking his mask of. Robin finds out that Batman is Bruce Wayne.
They leave when the ambulance arrives and sneak away into the bushes, where Robin eats reverse.
It starts to rain and they visit the graveyard, so Robin can say goodbye to his parents. Then both heroes cry.