Writing error free application is difficult. Error occurs at runtime due to unexpected user input, environment dependencies and other reasons. You must take care of all known conditions that leads the application to crash. Crashes cause user frustration...

It happens to you if you are a developer or debugger running VS 2008 and trying to use JavaScript intellisence for your favorite JS library. This just does not happen *only* to jQuery but any Visual Studio JScript document (- vsdoc.js ) You wont get intellisence...