From the list at Conservapedia (no, really) of examples of bias in Wikipedia.

- Wikipedia allows the use of B.C.E. instead of B.C. and C.E. instead of A.D. [Yes; allows - Fletcher.]

- Wikipedia often uses foreign spelling of words, even though most English speaking users are American.

- In breton "wiki" means liberal, and "pedia" means bias. The founders of wikipedia were celtic.

As a number of people have pointed out, any website which advertises its idiocy as prominently as this one does is going to be a magnet for parodists. So who knows how much of what's there is deliberately funny or just funny.