Dumbest Boy?

Akpos enters a barber shop. The barber whispers to his customer:

BARBER: This is the dumbest boy in the world. Watch while I prove it to you.

The barber puts a N50 note in one hand and two N10 notes in the other, then calls the boy and asks:

BARBER: Which do you want, boy?

Akpos takes the two N10 notes and leaves.

BARBER: What did I tell you? Akpos never learns!

Minutes later, when the customer left, he sees Akpos coming out of the ice cream store.

CUSTOMER: Akpos, May I ask you a question? Why did you take the N10 notes instead of the N50 note?

Akpos replied, "Because the day I take the fifty naira note, the game is over!"