Charades

Sparrow: 'Is it Archangel Michael?'
Pigeon: 'No'
Sparrow: 'Is it Rocky Balboa?'
Pigeon: 'No'
Sparrow: 'Wait, I know, is it a policeman directing traffic..?'
Pigeon: 'No...'

Sparrow knew it was The Angel of the North but he was making Pigeon wait. ;o)