All the Americans I've met were allways smiling and I keep thinking that even if I criticize them or tell them nasty things they will continue to smile at me it's impossible for me to guess what they're thinking. There is a habit, perhaps my conationals would feel like they're being laughed at. The true is that we have different values for different things and all depends on aour tastes, for example maybe a colleague likes porn so he would like to see a naked woman/man on the screen saver. Or maybe a subordinate loves his/her boss so he/she would love him/her to make a pass on her/him. But the rules are made to be broken, aren't they?