There was a deafening BANG, and Harry threw up his hands to shield his eyes against a sudden blinding light —
With a yell, he rolled back onto the pavement, just in time. A second later, a gigantic pair of wheels and headlights screeched to a halt exactly where Harry had just been lying. They belonged, as Harry saw when he raised his head, to a triple-decker, violently purple bus, which had appeared out of thin air. Gold lettering over the windshield spelled The Knight Bus.
For a split second, Harry wondered if he had been knocked silly by his fall. Then a conductor in a purple uniform leapt out of the bus and began to speak loudly to the night.
“Welcome to the Knight Bus, emergency transport for the stranded witch or wizard.“