Zach Galifianakis had no problem working with the Guinea Pigs in G-Force, even if they were often imaginary.  It all came easy to Galifianakis because he actually honed his acting skills all through high school by screwing with his classmates minds.  How?  By pretending to chat with a crowd of friends - while sitting by himself!

One man’s make-believe is another man’s schizophrenia!

Click onto media bar below the picture for Zach Galifianakis‘ trip down Insanity Lane.