Another development team at my company was working on a project and checked the presentation layer file in to source control, but forgot to check in the library/data layer file with the corresponding changes. Not a big deal, we all do it from time to time. What was shocking was the error message in the build log:
"C:\source\foo\bar\APage.aspx.cs (247): No overload for method 'SearchForFooRecords' takes '69' arguments"
SIXTY NINE FREAKING ARGUMENTS! What the hell were they thinking?!