1. A computer-implemented method comprising: receiving, during presentation of a media program, a media reaction to a portion of the media program, the media reaction determined based on sensor data passively sensed during the presentation; determining, based on the media reaction and the portion, a future portion of the media program, the future portion of the media program occurring later in the media program than the portion; and causing the future portion of the media program to be presented during the presentation of the media program.