Elementary school was a magical time. If these things weren't part of your grade school experience, then you didn't really live during those years!
If you rode the bus to school you probably aspired to ride in the very back seat. And you knew you had reached the height of cool when you finally earned the right to ride back there. All sorts of crazy things could go on back there far from the prying eyes of the driver! Of course mostly you just told dirty jokes or played stupid games but you made it back there and that was all that mattered!