Brian showed humor after the tornado by saying, "Is that the best you can do? Is that all you can hit me with a moose and a tornado?" Next he thought that won't get the job done. Then as he starts to fall asleep he hopes that the tornado hit the moose.
The correct statement is that when Brian sees a tornado he personifies to talk to the tornado by challenging him if this was the most powerful tornado could ever be to hit him with a tornado and a moose.
Brian also hopes that when he is about to fall asleep, he would think that the tornado has hit the moose.
Hence, the humor situation turned by Brian when he sees a tornado approaching is mentioned above.
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