title: How to simulate HTTP error 500 in django?
body: <p>I have set a HTML page 500.html in my main direcroty.
  It will show this page when <code>HTML 500 Internal Server Error</code> occurs.</p>
  
  <p>How can I generate this error to check if it works?</p>
  
  <p>I'm gussesing I should somehow raise exception of some sort.</p>
  
  <p>How do I do that?</p>