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For example,

http://en.wikipedia.org/w/index.php?title=User:This,_that_and_the_other/common.js&action=edit&preload=Sand

Obviously this particular case is ridiculous, but there are times when you would want to preload content into a user script page.

The error seen is:
[5705c3ae] 2012-11-11 04:43:11: Fatal exception of type MWException

I should clarify that this only happens when preloading onto user script and style pages, as well as MediaWiki pages ending in ".js" or ".css". For instance: 

http://en.wikipedia.org/w/index.php?title=MediaWiki:Nonsense.css&action=edit&preload=Sand

*** This bug has been marked as a duplicate of bug 41706 ***