This is what scares me about youtube/google. I just saw this post and then went to youtube and the same video popped up in my recommendations.
I wonder if it is some kind of cross-site cookie tracking.
I have always set mine up to block cross-site cookies, which causes Google searches to flag me with the Captcha program.
I grit my teeth and flip them the double bird each and every time I have to do it, which is several times a day.
They know what your thinking, before you even think it. Surrender!