Source : Free On-Line Dictionary of Computing

You know you've been hacking too long when...
     
        The set-up line for a genre of one-liners told by hackers
        about themselves.  These include the following:
     
        * Not only do you check your e-mail more often than your paper
        mail, but you remember your {network address} faster than your
        postal one.
     
        * Your SO kisses you on the neck and the first thing you think
        is "Uh, oh, {priority interrupt}".
     
        * You go to balance your chequebook and discover that you're
        doing it in {octal}.
     
        * Your computers have a higher street value than your car.
     
        * In your universe, "round numbers" are powers of 2, not 10.
     
        * You have woken up recalling a dream in some programming
        language.
     
        * You realise you have never seen half of your best friends.
     
        [An early version of this entry said "All but one of these
        have been reliably reported as hacker traits (some of them
        quite often).  Even hackers may have trouble spotting the
        ringer."  The ringer was balancing one's chequebook in octal,
        which I made up out of whole cloth.  Although more respondents
        picked that one out as fiction than any of the others, I also
        received multiple independent reports of its actually
        happening, most famously to {Grace Hopper} while she was
        working with BINAC in 1949. - ESR]
     
        (1995-04-07)