Q:

I AM A MAN, NOT A MACHINE

So, I just posted a long meta answer. It was the first interaction I've had with an SE website (other than loading pages), in about 9 hours. I was already logged in via cookie. I have over 45,000 reputation here on Arqade, and another ~7500 rep scattered around the rest of the network. I am about as trusted a user as a user without a diamond gets to be.
And yet, when posting that answer, which, I'll reiterate, was not a rapid fire action of any sort, I was confronted with a Captcha. This Status Completed MSO question indicates that users with over 10k rep should almost never see such a thing.
Why do you hate me Arqade? What did I ever do to lose your trust?

A:

Not sure exactly what you did there, but somehow you managed to hit the answer submission route twice within a few seconds. So the spam-checker got spooked and decided to test you.
Congratulations, you're probably human!
...for now...

