Justin Bieber pranks Radio Disney with Party in the USA

Justin Bieber pulled a April Fools prank on Radio Disney. He was in studio to sing some songs, and after announcing "This is a song off my first album" his guitar player started playing, and he started singing the Miley Cyrus song Party in the USA.The joke was ok, but I thought Justin could have went a little longer before saying "just kidding". It would have been funny if he would have sang