Which two sentences from the story develop a theme about making faulty assumptions?

"But I immediately received a hail of cuffings which made me jump straight out of the soaked sheets, and rush in my nightshirt into the corridor, the door of which I found open." (paragraph 13)
"I scented a practical joke in the air, as a dog scents game." (paragraph 6)
"My friends were fond of practical jokes. I do not care to know people who are not." (paragraph 2)
"The precautions I had taken in closing the shutters and going to sleep in the middle of the room. . . had only brought about the practical joke I had been trying to avoid." (paragraph 15)
"The hour struck for retiring; and the whole household came to escort me to my room." (paragraph 7)
"For at least another hour I remained awake, starting at the slightest sound." (paragraph 11)