Needless to say I opened a new tab, typed "n", and hit enter countless times today before my brain caught up with my muscle memory.
I do this too, and it's because this site is an addictive slot machine just like every other social networking site. I actually really hate this website, but I'm here almost every day, because I can't seem to break the habit. Neat. It's probably because I have a common impulse control / executive functioning disorder, and the way the front page works exploits some bug in my brain.
Reddit does this to me too. I also hate Reddit.