Maybe the kids are just more polite in the Houston area, but if I hear anything out of them when passing, it's usually "hey, cool bike!", or just a "hi". I've gotten a few "I like your jacket!" (about my hi-visibility lime green shell). Once I came upon a group of "bmx kids" riding towards me. One of them held out his hand when I approached. I stretched out my hand, and we did a high-five while passing each other (I did not know these kids). As soon as it was over, I heard him yell, "yeah!". It was pretty cool, actually....