10 Everyone who ticks him off gets a $26,000 phone bill.

9 He's won the Publisher's Clearing House Sweepstakes three years running.

8 When asked for his phone number, he gives it in hex.

7 Seems strangely calm whenever the office LAN goes down.

6 Somehow gets HBO on his PC at work.

5 Mumbled, "Oh, puh-leeeez!" 295 times during the movie "The Net."

4 Massive 401k contribution made in half-cent increments.

3 His video dating profile lists "public-key encryption" among turn-ons.

2 Instead of the "Welcome" voice on AOL, you overhear, "Good Morning, Mr. President."

And the Number One sign your co-worker is a computer hacker... (how come the number one is always the dumbest and least funny of em all?)

1 You hear him murmur, "Let's see you use that VISA now, Professor "I-Don't-Give-A's-In-Computer-Science!"