i do the same thing from time to time. it's the outward manifestation of this little thrill of accomplishment. i always make sure to say it with a flourish and sometimes even a little bow.
back when i was working maintenance in retirement homes i would whistle this little four note tune from time to time. it was my way of warning the old folks that the big bad scary hippie was coming around the corner. i didn't want any heart attacks blamed on my sudden appearance.