It wasn't in my car, it was my friends sierra HD. some guy on a horse was riding up my street and his horse decided to shit in front of my house, so my mom told us to go and find the guy and yell at him. so we hop in the HD and when we found him, instead of yelling at him we popped it into reverse and let the 8.1L V8 do its worst. i think the horse was pretty spooked.