David Letterman's Top 10 reasons why there are no black NASCAR drivers: (I bet his life will be miserable after the NAACP sees this!)# 10 - Have to sit upright while driving.# 9 - Pistol won't stay under front seat.# 8 - Engine noise drowns out the rap music.# 7 - Pit crew can't work on car while holding up pants at the same time.# 6 - They keep trying to carjack Dale JR.# 5 - Police cars on track interfere with race.# 4 - No passenger seat for the Ho.# 3 - No Cadillac's approved for competition.# 2 - When they crash their cars, they bail out & run.AND THE NUMBER ONE REASON WHY BLACKS CAN'T BE IN NASCAR...#1 - They can't wear their helmets sideways!