You go to Japan, and visit the equivalent of the 'crazy cat lady' to get a nyan-ing cat. Upon rediscovering the joys of human company, the woman captures you and locks you in her basement with yet more cats, frequently visiting you to talk about cats, while stroking a cat and sounding moderately like a cat. After a few days of this, you are located and freed. But you never recover, and you never utter any words but 'Cat', 'Nyan' and 'Help'.
I wish to possess a phantom Nyan-cat, which I can set on a person to drive them utterly insane by ceaselessly following them around, Nyanning.