See
http://meta.wikimedia.org/wiki/Village_stocks
It's currently centred on English Wikipedia with one exception, and I have
no doubt that silly mistakes happen on other projects too :-) Please add
yourselves (or others if you feel they deserve it, but be nice!)
We have a section of the Italian Wikipedia dedicated to the funny side
of wikipedia; it gave me motivation to contribute to Wikipedia when I
started. The page is