I decided that I was going to find out who killed Wellington even though Father had told me to stay out of other people’s business.
This is becauce I do not always do what I am told.
And this is because when people tell you what to do it is usually confusing and does not make sense.
For example, people often say “Be quiet”, but they don’t tell you how long to be quiet for. Or you see a sign which says KEEP OFF THE GRASS but it should say KEEP OF THE GRASS AROUND THIS SIGN or KEEP OF ALL THE GRASS IN THIS PARK because there is lots of grass you are allowed to walk on.
Also people break rules all the time. For example, Father often drives at over 30 mph in a 30 mph zone and sometimes he drives when he has been drinking and often he doesn't wear his seat belt when he is driving his van. (..)
Also I don’t know what Father means when he says “Stay out of other people’s business” because I don’t know what he means with “other peoples business” because I do lots of things with other people at school and in the shop and on the buss, and his job is going into other people’s houses and fixing their boilers and their heating. And all of these things are other people's business. (..)
So I decide for myself what I am going to do and what I am not going to do.

(Mark Haddon "The Curious Incident of the Dog in the Night-Time")