What song is this?? Heeeelp?

I can't remember the lyrics but the video starts with a man waking up in the morning, and every thing's colourful and childlike. Then he goes in this car with his friends, and there driving to a carnival and theres a purple dog in the car. And it's like 'dont, dont you know, dont you go, no no no noo' I dont remember but its awesome. Help please (=