I would imagine speed would have something to do with the trajectory of the ketchup/catsup... you may end up just making your fender more yummy looking... Unless you have some kind of "Popeye" grip... he could make spinach fly pretty far out of the can...
Maybe mustard would be better, if you were ever in an accident, a few busted catsup/ketchup packs could drive the paramedics nutz...
