Task: Story Composition
Input (English): Premise: Sam loved to play with Legos. 
 Initial Context: Sam built a huge tower out of the Legos. 
 Original Ending: Sam's brother liked to run around the house. Sam's brother didn't look where he was going! He ran right into Sam's tower! 
 Counterfactual Context: Sam built a spaceship out of the Legos.
Output (English): Sam's brother liked to run around the house. Sam's brother didn't look where he was going! He ran right into Sam's spaceship!