When I was growing up there were a couple of kids in the neighborhood who would never pass up an opportunity to hop on the back of a truck driving down our street. One kid jumped onto the UPS truck and disappeared around the corner, then showed up again about an hour later looking pretty battered and bruised. The truck headed out on a main road and never stopped again, and he apparently had to jump off while it was no interest at a pretty decent clip. LOL.
Sorry ... while it was MOVING at a pretty decent clip.