Related:

• You know you've been hacking too long when... ...you want to compile busy traffic so that it will run faster.
• You know you've been hacking too long when... ...you try to ^Z out of Quattro.
• You know you've been hacking too long when... ...your radio is playing
  and you're starting a big compile on your home box, and it occurs to you that the music will begin to get a bit jerky, because you think it's playing through the computer and you're not quite sure how well it'll multitask with the compile....
• You know you've been hacking too long when... ...after writing a big report, you try to backspace in a pen and paper letter.
• You know you've been hacking too long when... ...you see a flock of birds and try to figure out the algorithms that determine their movement.
• You know you've been hacking too long when... ...a fly lands on the screen and you try to pick it up with the mouse and put it in the onscreen trashcan!
• You know you've been hacking too long when... ...you open a window to find a phone number in a file, then try to cut & paste it to the phone.
• You know you've been hacking too long when... ...in art class you make a mistake in a drawing and look frantically for the undo button on the paper.
• You know you've been hacking too long when... ...you begin to think in nested IF-THEN-ELSE clauses that would make a bureaucrat get lost.