Well, Brain is always obsessed with his plans and goes to extreme lengths to try and follow through with them. Plus his plans always fail. One episode when Brain makes a machine that measures smarts it said that Pinky was the genius. Plus, Pinky doesn't act insane at all while Brain on the other hand is obviously insane
yes pinky and the brain
one is a genius
the other's insane
Did you know that Pinky is the genius and Brain is the insane one?