Figure out the punchline

I RAN OVER A SPEED BUMP. IT WAS SCREAMING, 20 MINUTES LATER I GOT PULLED OVER BY A POLICE OFFICER WHO CAME TO MY CAR AND ASKED “SIR YOU RAN OVER A PEDESTRIAN” I SAID “IF HE’S BLACK AND WEARING YELLOW HE’S A SPEED BUMP.” THE OFFICER SAID TO ME “YEAH THAT CHECKS OUT HE WAS WEARING YELLOW AND HE WAS ALSO BLACK”