premise: You're Fired<br>Daniel was a hard working employee at his office. He had a few bad habits that would get him in trouble. One day he decided to play a prank on his boss. He spiked his coffee with laxatives. His boss found out and fired him on the spot.
hypothesis: Daniel put laxatives in his own coffee.
reason: It was difficult for the system because the use of the word "he" refers to both Daniel and the boss. If the statement said "Daniel put laxatives in his boss's coffee" or one of the subjects were female the computer would not have been fooled.