I have a funny story about wikipedia :D
My Dad is an old man whose heritage stems from Eastern Europe, specifically Lithuania. He's the kind of person who takes great pride in his heritage, and must be proud of every aspect of it. He's also very into cooking, and finds cuisine very interesting.
So naturally, me and my brother decided to fuck with him. He knows little about computers and the internet, he knows jack shit about wikipedia. So we went to the wiki for Lithuanian Cuisine and edited it to basically say that the food of lithuania is commonly thought to be of the worst and most unpalatable in the world. We put in all this encyclopedia-esque factoids about how 'experts of cuisine don't consider Lithuanian food to be a legitimate cuisine' and shit. Basically that its complete shit.
Now mind you, two of his main interesting and passions are heritage and cuisine. Needless-to-say, we showed him the wiki... He nearly imploded. He flipped is fucking wig, man, he got SO fucking mad. It was hilarious. He started just going on and on and on about how these people dont know shit, and what kind of fucking encyclopedia is this... etc etc...
It was very funny. Eventually we explained to him the concept of a wiki, and he got a kick out of it.