Well, those of you who don't already think I'm a moron will change your opinion after reading this.
I left at around 8:15 to get to FedEx field at 8:45. The last 3 times I've done this, I simply got on 95N and got there in under half an hour. Unfortunately, I neglected to remember that I live in Falls Church now, not Alexandria as I had when I've gone the past 3 times. In my semi-awake state, I figured all I had to do was get on 95N and it would be right there as always. So I happily and blindly drove around 495 to get to 95N, noting what good time I was making. I easily got onto 95N, set the cruise at around 80, and thought what a nice day it was to drive some new Mazdas. About 10 minutes later, I started to get a weird feeling that I wasn't going the right way. I then realized that FedEx Field is not off of 95N proper, it's off of the Beltway portion of 95N, E. of DC. I then noted a feeling coming over me that was partway between a Homer-style "doh" and an angry, self-hating rage. I was now about 30 mi. away from FedEx field, heading away from it at 80MPH. At that point, I decided to simply turn around, go back home, and wallow in my self-inflicted stupidity. I started a couple of house projects I should have been doing in the first place, trying my best to pretend the last hour and a half hadn't happened.
On the bright side, all I really wanted to do was drive the new Miata, so I didn't really miss a heck of a lot. But unfortunately my list of "stupid shizz I've done that I can't blame on anyone else" has grown by 1.