Greeting ethnography clarification

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Greeting Ethnography
One thing that I learnt as I crossly scrutinized the act of greeting as exhibited different people, is that the rules of saying hello are very intricate at times, others very interesting and some indeed quite odd. In the world over, ordinarily people shake hands upon meeting, in many cultures, they do also kiss. The act of kissing as a way of greeting also varies, between cultures, people and circumstances. When some kiss on one cheek, others do kiss on both cheeks, yet others kiss three times.
The types of greetings that I encountered at a public park were as interesting, customized, strange and formal as they came. Two grown men with some prominent moustaches who were the first that I came across just as I was commencing my observation, got into some kind of light back slapping after a casual hand shake. I was able to scan a group of African boys whose greeting happened in stages, they first did the ordinary hand shake once, then transitioned in quick succession to what I can call an ‘upside-down) hand shake, that involved swiveling fingers towards the top of the other persons hand until they encircled the others` thumb, and then they finished the greeting with the ordinary hand shake.
While I found most greetings customs quite formal, the traditional hand shake and the upper body hugs, I must say that some rituals were almost scary. Two girls in particular, who must have been college students, were not holding backing in public display of affection. Their ritual was between yelling and body a language that was almost obstructing passersby. Just when I thought I had seen all the greeting etiquette, I was treated to a Japanese bowing tradition that involved a bow and a nod as a greeting, when this old Japanese couple endowed with humility and noticeable excitement ask me ...