Keyboard Shortcut For Entering Screen Saver How can I enter Screen Saver without wating few minutes? Is there an application I could run, keyboard shortcut maybe? I'm using rMBP running ML.

EDIT: All I found was using Hot Corner as explained here: https://www.apple.com/findouthow/mac/#quickscreensaver 

Basically it means I have to move my mouse cursor into a corner and maybe comine a key such as command to enter Screen Saver. I don't really like this solution.
If you open Keychain Access (I use Spotlight, but you can go to /Applications/Utilities), go to the main menu and hit Preferences... (or Command-,) you'll find a checkbox labeled "Show keychain status in menu bar..." If you check it, you'll get a little lock in your menubar.



If you click "Lock Screen", your screensaver will activate. I use this at work as an OSX Control-Alt-Delete alternative.

(Note: it will require your user password to unlock the screen. This may/may not be desirable.)