How did Anand's father become the target of the burglar alarm?
Anand's father became the target of the burglar alarm because Anand had rigged the alarm to work only when the door was opened gently or stealthily. He assumed that a thief would open the door softly.
However, Papa also always opened the door softly. When he returned home, the alarm was triggered and the water bag fell on him, leaving him thoroughly soaked and angry.
Explanation
The chapter explains that Anand designed the alarm specifically for thieves: 'A thief tries to open the door stealthily. I've rigged it up so that the alarm works only when the door is opened gently.' The flaw in his design was that his father 'always opens the door softly,' making him an unintended victim of his own son's invention.
Solution Steps
Anand rigged the burglar alarm to activate only when the door was opened gently or stealthily
Anand assumed that a thief would try to open the door softly to avoid detection
Papa also had the habit of always opening the door softly
When Papa returned home and opened the door gently, the alarm was triggered
The water bag fell on Papa, leaving him soaked and angry