I saw a hilarious one yesterday, but it's Dutch so I'll spare you the trouble of posting it. It was about a hacker who had broken in the autocue of a national news show. First he made the text scroll very fast, which made one of the presenters talk very fast. And after that he changed the text. Making up stuff like, Max Cornelisse (the hacker) won the nobleprize for piece, but he can't pick it up, because he has a date with "Lieke ;)" (with the smilie said in words :D). Then the other presenter kinda flips.
Too bad it was a hoax to convice people to study ICT (making computer programs).