Stop singing, Donkey!

Simon was singing along to Bernard Fanning while he was driving Harrison to daycare the other morning, and he kept singing after they'd arrived and he was leaning into the back seat of the car, putting Harrison's shoes on. He was just thinking what a lovely father-son moment they were sharing, when Harrison burst out at the top of his voice with "Stop singing, Donkey!" (a la Shrek 1).