I love when I hear people say "re-bonjour." I don't think it's officially a word in French. But say you're shopping at the supermarket, and you've already said hello to your neighbor from down the street in the canned goods aisle. You meet again next to the yogurt, and one of you, with a little smile, might say it. It's polite, at the same time acknowledging that there's no need to make much of an effort the second time.
Trying to get back into writing, now that I'm off the road. Have to start somewhere, so this is it.