Lately DS (almost 2.5) is into singing little familiar songs with a surprise 'joke' ending. His current favourite is from an episode of 'Word World', where a character sings "Twinkle twinkle little ants, I have purple underpants" - except DS will insert a dramatic pause at the end, lift up one foot and sing "under.....FEET!" instead of underpants, and then laugh his head off. He's all about subverting language and making up words lately, it's kind of like a one-man game of Broken Telephone half the time.