Why did KITT become more and more human and you wind up forgetting that he is a computer?

Just finished watching this episode, the storyline was a bit predictable with the truth of certain twist in the episode, but it didn't stop it from being an overall entertaining and funny action packed episode. While the main story of the episode helps to touch upon reas that the pilot had yet to address, the story I enjoyed the most was how annoyed KITT got with the bear Mighty Mouth, it really makes you love this series even more, as each episode continues KITT becomes more and more human and you wind up forgetting that he is a computer.