Jews... or the mistery of the hat transfer...

First of all let me state that I have nothing against the jews... or any other religion.
But this weekend I found myself thinking about two of me most marking jewish traditions: the use of the kippah (that small round "hat" the jews use) and circumcision. I wonder if anyone has ever noticed that although jewish doctrine requires that the head is covered at all times, it also requires that another "head" is uncovered at all times. I think it represents wrongful advertising.