php zombie
"The Zombie Walk happens when I get so engrossed in my thoughts that I’ll begin pacing around the house in a semi-conscious, meditative state. I’ll walk to a window and stare outside for a while, then I’ll wander in circles around the living room, then I’ll pace into the library and stare at the bookshelves, then I’ll walk back and forth through the kitchen. This goes on without any real awareness of what I’m doing. My mind is totally focused on the problem, oblivious to the fact that I’m wearing a groove into the floor. To amused observers it appears like I’ve become a Zombie. "
http://www.ellislab.com/index.php/the_zombie_walk/
In my house we call this "code mode".