For more 20 years my aunt and uncle had a bird named Chi Chi that my uncle found sitting in a tree outside his office one day. (They put an ad in the paper looking for his owner but never heard from anyone so they kept him.) When they found him Chi Chi already knew the Notre Dame fight song, how to whistle Dixie and lots of other songs. Even years later he would suddenly bust out a song they didn't know he knew.
He was in love with my aunt and would whistle a song and dance around his cage whenever she came in the room.
I saw this video on Boing Boing and cracked up thinking of him.