Isaac loves "Poker Face". I don't know why. I don't even know how he first heard it. I only downloaded the song after he began asking for it ALL. THE. TIME.
"Faaaaaaaayyyyyyy zzzzzz! Mama! Faaaaaaaaaaaaaaaaaaaaayyyyyyyyyyyyyyyyyyyy zzzzzzzzzzzzzzzzz!"
We listen to it on repeat. I know all the lyrics and sometimes can appease him by singing it to him if my phone or ipod is not readily available. Sometimes he will start singing it on his own.
"My my my my Faaaaaayyyyyy zzzzzz!"
And he's got some crazy dance moves. His signature move that he made up all on his own: The Sneeze. :)