WP Lucky Search

WP Lucky Search adds a Google like I’m feeling lucky button to the WordPress Search form and redirects to the random post depending upon search term.
If search term is empty it just fetches any random post from the results.

WP Lucky Search might also help you to reduce the bounce rate of your site by attracting visitors to I’m feeling lucky button, which will help you to increase the ranking of your site.

It also has few useful settings like you can include/exclude public post types to fetch search results from, alert messages and caption settings.

Features

• Redirect to random post based on saerch term
• Search in selected public post types
• Control the I’m feeling lucky and search button captions
• Control visibility of Lucky and Search buttons
• Translation ready
• Alert message settings

You can find more here.