Random Post from Custom Post Type

My website http://www.animewolf.tv has a bunch of series for different Anime’s with embeded players.

Each series is part of a custom post type, here is an example on one.

http://animewolf.tv/series/hacksign/

If you look on

http://animewolf.tv/watch-anime/

it has a list of all of the shows.

I want to generate a button with a ‘surprise me’ so when people click on it, a random show will be displayed.

For example, if you click on it you could get..

http://animewolf.tv/series/hacksign/

then again you would get
http://animewolf.tv/series/dragonball/

then again

http://animewolf.tv/series/death-note/

etc..

any one have any idea how to do this or if I can get a plugin for it?

EDIT:
What I would like can be shown here:

http://www.animeseason.com/

(Left hand side, where it says ‘Random Anime’)

Would be super appreciative. thx