You will need the Fist Of Ruin ability to get the Wall Run ability. I dont remember how far you have to go in the game to get the F-O-R ability. To use the Wall Run, run towards a wall and press R1.
My favorite character is Lui Kang.
Peter (when he's hungover): This sucks worse than that time I went to that museum. (Flashback to childhood, standing in front of dinosaur skeletons.)
Peter (as a child): Why did all the dinosaurs die?
Man at Museum: Because you touch yourself at night.