'Disillusionment Charm,' said Moody, raising his wand. 'Lupin says you've got an Invisibility Cloak, but it won't stay on while we're flying; this'll disguise you better. Here you go--'

He rapped him hard on the top of the head and Harry felt a curious sensation as though Moody had just smashed an egg there; cold trickles seemed to be running down his body from the point the wand had struck.

'Nice one, Mad-Eye,' said Tonks appreciatively, staring at Harry's midriff.

Harry looked down at his body, or rather, what had been his body, for it didn't look anything like his any more. It was not invisible; it had simply taken on the exact colour and texture of the kitchen unit behind him. He seemed to have become a human chameleon.

Chapter 3