(I added the 5000 since presumably by the time I looked it was out of the top 50)
[32334e37] 2012-07-23 13:45:38: Fatal exception of type MWException
/me continues to mutter about how $wgShowExceptionDetails=false is annoying. It'd be swell if the powers to be could look that Exception up in the error logs.
Originally reported on support desk by Yosri: http://www.mediawiki.org/wiki/Thread:Project:Support_desk/wiki_fatal_error