Unable to open Page due to Web Part Error . "Saviour" Web Part Maintenance Page

At some day you decide to test your new webpart and unfortunately web part bombs badly and you end up with page which looks something like this :




Now second thought is to open the page using Sharepoint designer and removing web part , but to the height of disappointment even Designer throws all kind of error.You are all stuck thinking "How can i remove web part ? "

Well trick is to append your page url with querystring " ?contents=1 ".

So if your stuck url is http://localhost then append the query string
http://localhost?contents=1

This will take you to the saviour page "Web Part Maintenance Page" ,remove the webpart and have a happy day forward :)