Related:

• You know you've been hacking too long when... ...you match each
  ( with a :-) to keep the parentheses balanced....
• You know you've been hacking too long when... ...you send your SO notes like
  while !(together(you,me)) miss(you)...
• You know you've been hacking too long when... ...the message `New mail in /usr/spool/mail/foo' becomes an NMI.
• 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... ...you're writing a homework assignment, and get to the end of the line in the middle of a sentence, tack on a '\', and continue writing on the next line.
• You know you've been hacking too long when... ...you send email to somebody who's three terminals down the lab.
• You know you've been hacking too long when... ...you get snail mail, and you think to your self "You have new mail on node "your_address" from user "name_on_the_frank".
• 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... ...people talk to you while you're trying to work, and you think, "mesg n".