Exam promise

Akpos read from cover to cover preparing for his entrance examination. His father came to his room and saw him reading.

FATHER: Akpos, make sure you pass that exam otherwise just forget that I'm your father!
AKPOS: Sure thing dad, I'm bound to bring smiles to your face.

5 HOURS LATER...

FATHER: So my son, how was your exam? I'm sure u passed it excellently...
AKPOS: Sorry excuse me, do I know you?