Related:

• You know you've been hacking too long when... ...you start dreaming code.
• You know you've been hacking too long when... ...you can't sleep any more, because you're stuck in the garbage collector and it keeps dumping with Illegal Instruction.
• You know you've been hacking too long when... ...after days with YACC, you start to parse your conversations.
• You know you've been hacking too long when... ...you start dreaming in Tetris and trying to rearrange the furniture so it all fits neatly against one wall.
• You know you've been hacking too long when... ...you're reading from paper media and when you finish the page you press the spacebar.
• You know you've been hacking too long when... ...your children do something they shouldn't do
  you tell them to stop, they do it just once more anyway, so you think "Well, they prefetched the instruction and are executing it in the delay slot....
• You know you've been hacking too long when... ...you wake up and desperately try to start a compiler so you can use the 15 minute waiting period to sleep some more.
• You know you've been hacking too long when... ...you order on the phone from a catalog, and start to give the operator your email address.
• You know you've been hacking too long when... ...you start doing stuff like: cc -o a.out foo.c