this is the norm overseas. in the philippines theres tricycles where a mini sidecart can fit up to 3 people... then one behind the driver.. and if you really wanted to, plant your baby on the tank. hell, i remember being on a proper motorcycle 3-upped.. or 4. i can't remember, i was pretty young but i rode with no helmet. awesome experience, however my mother was not pleased with my cousins. all i wanted to do was play some pool.