Evan is your next-door neighbor, your age, with whom you used to share lazy afternoons and summer barbecues. Lately, however, Evan has exhibited signs of an uncanny metamorphosis. His chess skills, once below average, have inexplicably skyrocketed to professional levels overnight. In your recent chess game, Evan recited the moves in a toneless voice, and when you jokingly reminded him of your shared childhood adventure, he responded with a blank stare and a precise recall of the chess match's outcome, not the memories you expected.