Don't ever think you are smart enough =.="

I have a friend (identity a secret),
He said you can give any question in this particular subject,
He can solve all of it.
But sadly, he's marks in the exam was not good, nearly failed,

I asked him,

Amir: What the hell happen, dude? What's with the marks.
Dude: I don't know, it just like this (in a sad tone)
Amir: What happen to the any question i could answer quote?
Dude: I just don't know, how's your mark? Good?
Amir: Better than you, i guess :D I am actually shocked because you taught me a lot about this subject therefore, thanks a lot dude :D
Dude: Ya ya (very sad tone)

Moral values:
1) Don't be too proud when you are good in something.
2) Modest is the best policy :D