Charisma

Charisma. You've either got it or you haven't. If you haven't got it, good looks or beauty can go some way towards making up for it; and if you have got it, it doesn't matter too much if you're ugly. 


So that just leaves people like me!


Speaking as an uncharismatic person but as a gentleman, I always try to address the less charismatic people in a group and ignore those bursting with charisma. It drives the latter mad! 
A good tour guide will make sure that he gives the same amount of eye contact to each member of his party. I don't like it when I get shut out and can't decide whether it's because I'm uncharismatic and ugly or because I'm uncharacteristic and ugly AND look slightly haggard and fanatical.