Some people have asked "how I knew" that it was time to turn in my thesis.
It's actually not that hard, if you watch for five simple signs:

1. Your Powerbook's hard drive is full. Here's mine at 4pm on 8/14/01, just before I handed in the thesis:

2. The really useful letters on your keyboard only work part of the time:

Unedited touch-typing sample from my Powerbook:

the quk brown fox jumped over the azy do
the quck brown fox jumped over
the quck brown fox jumpd ovr the lazy dog

3. Some guys with crowbars tear down your office:

4. Even your advisor has left the lab.

5. MIT ring glows red; beaver emits stinging death ray: