Howdy?

You know what I hate the most? When you're walking in a public place with people everywhere and you see someone you know, let's say a school campus. You know this person, let's call him Charles, enough so that you'd say hello but only if he said hello first. And he does! So then you wave and give a jolly "Howdy!" only to have him completely ignore you and hug the person behind you. He didn't notice you, or at least you hope he didn't, so you quickly lower your hand and keep walking. You're not hurt that he wasn't in fact saying hello to you, but more embarrassed by the fact that he wasn't and you thought he was. Because it was awkward.