I knew a guy who was stuntin' his new bike (barely 3 months old) and did a wheelie and flipped it... towed his bike home, called the insurance co and said he hit some gravel in x canyon, claims adjuster came out looked at the bike and knew right away he was doing a wheelie, etc. just by the way the bike was scratched up and how the pipe and rear end was smashed in, etc. They did, however, pay for the claim.. but insurance adjusters know more than you think... Not to say he would know from the track to the sand but you never know ..