The reality one I found on CafePress. The Discovery Channel store really dropped the ball on that one. They've had a couple available on their site, but that quote has never been one of them. People had mentioned it in their comments on the site, as well as on the fan site. I looked
so hard for that one. It's my favorite quote from the show, and I just had to find a shirt with it for DH.
The SQL one is basically saying find users that have a clue (clue is greater than zero), and query returns no results (nobody has a clue). It's definitely a geek shirt.
TCP/IP is how the Internet communicates. It's pronounced letter by letter, so the "but mostly I-P" is funny on a baby's shirt because of, ah, all the wet diapers.

Again, definitely a geek shirt.
Yep, DH and I are geeks.