Grim Adventures Of Billy And Mandy (the) Easter Egg - Talking Heads

In the episode, Duck! It opens on Grim's dream, towards the end he says "This is Not My Beautiful House! This is Not My Beautiful Wife!" and when he wakes up Billy is repeating the words "Same as it Ever Was".

This is a reference to the Talking Heads song "Once in a Lifetime" which features all these words