I looked on Youtube but I couldn't find it. All I know is the description of the episode, I don't know the name of it.
Oh well, the avatar is still cool eh?
It's from an episode all right. It's the one where Bart gets a 'bigger brother.' Bart's out waiting in the cold for ages and Homer returns. He talks to him and then he says. 'Now give your dad a hug.'
During that, his face melts and it looks awesome.