the windows were tinted so dark that the car might have been driving itself- then one of the white girls tapped fat charlie on the shoulder and asked him if he knew of any good parties on the island that night , and when he said he did n't , started telling him about one that she 'd been to in a cave two nights before , where there was a swimming pool and a sound system and lights and everyfink , and so fat charlie completely failed to notice that the black mercedes was now following the minibus into williamstown , and that it only went on its way once fat charlie had retrieved his bike from the roof of the minibus ( `` next time , you should bring the lime '' ) and carried the bike into the hotel lobby .