You Don't Know Jack.

[technobabel]

The word "jack" in the phrase, "You don't know jack" doesn't mean somebody's first name.
Let me cut to the chase, "You don't know jack" is http://en.wikipedia.org/wiki/You_Don%27t_Know_Jack
The quiz questions in YDKJ are very challenging, slangy and often downright obscure,especially for non-native English speakers. In terms of wealth of (trivial) information to learn English from, YDKJ can be consider a gold mine. Safe to say it is not your typical English learning materials.

You may be able get a taste of it at http://www.youdontknowjack.com/