I found this awesome video where the Happy Tree Friends are performing Happy. It is awesome and I bet you would love it. If you remember from Despicable Me 2, the song Happy the one that goes "It might be crazy what I'm about to say... Because I'm Happy! Clap along if you feel like a room without a roof" That Happy song, well here is that song preformed by Happy Tree Friends. There is also a special ending with Flippy in it. I hope you enjoy it!