Sometimes your visitors may just want to read a random post on your blog.
This is a good thing to implement on your blog.
All you have to do is make such a url:
I have seen many big bloggers using this and I have been asked many a times how to do so, thus I decided to make this thread.
EDIT: My sleepy head cannot understand what I am missing out on and why this is not working, but you can try this.
And I really stress on using this, as this is a way even your old posts that have been buried can get a few visits.