IRC was used on an episode of CBS' Numb3rs as a secret hacker communications system. Here's a video skewering all the things they got wrong:

[media]http://www.youtube.com/watch?v=wXW-HnRSrbQ[/media]

The point here is that a lot of what you think you know might not be so, if you learned it from TV. And you might not even be consciously aware that you know something from a TV show, if it's spread around by viewers of the show and by other TV shows repeating the same bad information.

And it's not just computer information. Consider how many people oppose private ownership of guns because of what they see in crime dramas and because they think it's representative of everyday life in the US. The same applies to the effects of recreational drugs. How much War on Drugs fever is from nonsense hysteria fanned by TV shows?