This isn't really a hint, just something fun to do, go to the Quarry Lake track, and select your truck. From your starting position, turn around so your driving in the wrong direction, then just follow the track until you reach the abandoned house near the 1st to last checkpoint, then smash into the huge water tower next to the house, if you aim correctly, the tower will come smashing down on the home, although no damage will come to house or the tower, it is still real interesting.