Car seat + The Child= poop

No seriously. For the last week everytime I put the child into her car seat and leave the house, she promptly poops. What gives!! I'm not talking about "the oh I can just change her in the back seat of the car and continue shopping"sort of poop, no I'm talking about the turn the car around and place child in bath sort of poop. This is cramping my style, how am I supposed to get stuff done?!? On another, far more personally satisfying note, I am all out of wipes (laundry day) and therefore I must acquire more.