The only time I've noticed this feeling is when I'm sitting at a traffic light somewhere, not really paying attention. Mind wandering off to... the song on the radio... where was I going after I go where I'm going now... did she really say that, or did I imagine it... am I thirsty...
Then, out of nowhere, I notice that I'm moving forward. That can't be, can it? My foot's on the brakes! My other foot's on the floorboard! Panic sets in.
Then, I realize it's just that a car next to me has decided to back up for some reason. The subconscious view, out of the corner of my eye, of that car backing up has led my brain to think I'm going forward. It's such a weird feeling.
If this were happening to me in my computer chair, I might rethink the amount of time I spend on E2....