I'm not the first one to open up and talk to strangers but my son is much more confident and would randomly say hi and talk to strangers (generally to children

I'm not the first one to open up and talk to strangers but my son is much more confident and would randomly say hi and talk to strangers (generally to children of his age but I've seen him wave to adults across the street). It is certainly not by watching me :) - but then it is possible that the extroverted behaviour, by definition, gets observed more and hence emulated more.