What is it about the bump?

I just don't get it.  Why do people seem to think that a pregnant belly is public property?  If I see a fat person, should I go up to them and rub their belly like a budda?  Will it bring me good luck or something?  Today marked the first day of my need for a shirt that says "Touch and Die".  On a more positive note, I was comparing pictures of this pregnancy with Buddy Blue's, and I am no where near as big as I was with him.  So that rules out a multiple pregnancy, now it is just a waiting game till next Wed for the ultrasound.  I am so nervous and paranoid.