First some double typing in NCIS to avoid a "hack".
CSI:NY provides us with the awesome "I'll create a GUI interface using Visual Basic, see if I can track an IP address"... or, you know, use the existing traceroute, or tracert in Windows, or the hundreds of existing free apps to do the same thing.
Then there is Numb3rs rather bizarre description of IRC. Luckily she speeks leet.
So there you having. Three stunning examples of Hollywood's amazing grasp of technology. I do like the theory that maybe they are just trolling us geeks :)