premise: Scooter is an animated character used by Fox Sports during Major League Baseball games. The character, a baseball with human facial characteristics, is voiced by Tom Kenny (best known for his work as the voice of SpongeBob SquarePants) and was designed by Fox to explain different types of pitches with the education of children in mind.
hypothesis: Scooter is a sphere-shaped character with human facial characteristics.
reason: Baseball's are sphere-shaped and Scooter is a baseball with human facial characteristics.  I think this was difficult for the system because they would have to know that a baseball is sphere-shaped.