Being a Bloke.
If you look at these 46 chromosomes with a microscope, you'll see that 45 of them are the same in boys and in girls, but that the 46th chromosome is different. It's quite large in girls where it carries about 1,500 genes, but in boys it's tiny, and carries only 78 genes. So guys, next time you go thinking that you are the Lord of Creation, just remember that your pulsating masculinity is made possible by just 78 genes. In fact, you can think of women as the luxury model with all the options, while guys are the cheap economy model without the air-con, power steering and cruise control.