I've been carrying critters in the back (and front) for over 20 years, and I assure you, some of them are swimming in the very, very shallow end of the gene pool. Some people are total idiots, and shouldn't be allowed outside alone, much less inside a helicopter. And it often seems that the richer they are, the stupider they are, but I haven't figured out why this seems to be so. It's also a well-known fact that if a passenger can't close the door, (s)he's almost certain to be a petroleum engineer, at least in the oil patch.