Software development takes immense intellectual effort. Even the best programmers can rarely sustain that level of effort for more than a few hours a day. Beyond that, they need to rest their brains a bit, which is why they always seem to be surfing the Internet or playing games when you barge in on them.
Joel SpolskyIndeed one of the best ways to deflect attacks is to make it look like they're succeeding. It's the software equivalent of playing dead.
Joel Spolsky