The phrase "Hey, how's it going?" and permutation there of have got to go from walking vernacular. When two people are passing each other on the street there's just not enough time for the long winded highly impersonal exchange of greetings...
-Hey, How's it going?
-Just fine, and you?
By the time I get to 'Just fine' the other person is behind me. If I just leave it there I feel like I've been self-centered by not asking after his/her welfare in return. If I try to squeeze in the 'and you?' it's too late, there's not enough time, even if they heard me I'm always out of earshot for the response. Am I the only person that see this exchange as socially non-optimal?
If we both just said, 'Good afternoon', that would get as much pleasantry out of the way without leaving me stranded in the wake of self-conscious stupor.
Be warned: The next person I pass who pulls this on me is getting strongly rebuffed. Let me give you a little visual.
Bob walks past David
Bob: "Hey man, how's it going?"
David: *Calling over his shoulder* "Fuck you Bob. Fuck you."
Or, I guess we could all walk slower.