Related:

• You know you've been hacking too long when... ...you send E-mail and end each line with \n.
• You know you've been hacking too long when... ...just when you finish writing the be-all-end-all program for your computer (has everything-AI
  MIDI, productivity stuff, excellent games, desktop video, etc....
• 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 think "grep keys /dev/pockets" or "grep homework /dev/backpack...
• You know you've been hacking too long when... ...it takes a conscious effort NOT to pronounce the 'd' at the end of common words.
• You know you've been hacking too long when... ...the funniest joke you came up with over dinner has the punch line
  "But what if it was in hex?" ...and the people you were with also thought it was funny....
• You know you've been hacking too long when... ...you get a thank-you note from the local power company, along with a co-signer form for next month's bill.
• You know you've been hacking too long when... ...you start typing semi-colons at the end of sentences instead of full stop
• You know you've been hacking too long when... ...in a dream, you are walking down a path (using PostScript's pathforall) and get woken up by a closepath.