Patrick SmartPants is the more intelligent version of Patrick, with interest of science and music. He is less interested in the "unintelligent" hobbies that the normal Patrick would do.
Patrick SmartPants has emerged when normal Patrick's head has been accidentally cut by smashing through a wall as a result of falling from a cliff. SpongeBob then screwed in the "smart" head into Patrick, thinking it was Patrick's original head. The "smart" head accidentally formed Patrick SmartPants where he acted intelligent for the rest of the episode.
Further towards the episode, Patrick SmartPants did not like how his friends treated him and misses his old friends' interaction with him. He said that would rather sacrifice intelligence so that he can have friendship, so he took out his "smart" head and put Patrick's old head back on. From there, Patrick SmartPants becomes the normal Patrick once again.
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