Not so much difficult as unexpected: I was shown a video clip (the first time I've ever been asked questions related to a video example) of a group of children playing basketball where two of the children proceeded to fight over the game.The interviewer paused the video and asked what I would do in that situation. After answering, he let the video continue playing and asked me questions about how the adults (clearly those employed in positions similar to the one for which I was applying) responded to the situation.
