I have a friend. Let's call him "Joe" for now.
So Joe is 18 years old. He still lives with his parents and his
grandfather, and walks to university everyday. Every morning before
he leaves the house, his grandfather would say the same thing to
him over and over again: "be careful when crossing the
road, don't cross if the light is red, cross if the light is green,
look to your left and right before crossing..." Joe was
very irritated with those lame advice being repeated everyday. One
day Joe could not take it anymore and bursted out: "KEEP
QUIET LAH! OF COURSE I KNOW! SUCH A SIMPLE ADVICE!" and
stormed out of house.
Not long after that, his grandfather died. Joe was very sad. Joe
always loved his grandfather, just that sometimes he was irritated
by the nagging. So Joe tried to recall the moments he spent with
his grandfather, tried to recall their conversations. But he
couldn't remember any, except the red light green light advice. Now
he realized that, giving that lame advice was the ONLY way
his grandfather could have had a conversation with
him.
Parents and old people don't nag because they like to bother you.
They KNOW that you don't like the nagging. But they still HAVE to
nag because they care so much about you. NO ONE ELSE in your entire
life will ever nag you knowing the consequence of the expected
black face from you.