LOL! Good question. I never thought about it until just now!

I usually count 1st, 2nd and 3rd up, then quit. And, I've had so many different bikes over the years, I'm ALWAYS reaching for another higher gear.

And, I count along with motor revs, raising the voice in my head to match the revs... firrrrrrst, seccccoonnnnnnnd, thirrrrrrrrrrrd...

I also count down from the top, too, but invariable start as if I were driving a 6-speed bike - the first click down, I'll think "5th", then "4th", then "no, wait, dammit, this is only a five-speed, so, where was I..... Oh, look, there's the neutral light."

Kirk