Dialogue is important.

Dialogue between Math teacher and pupil:
Math teacher: Look boy. Addition is very easy. If I have 5 bottles in one hand and 6 bottles in the other hand, so what does this mean?
Pupil: It means that you have problem with alcohol?
Math teacher: No! It means that you have 11 bottles !!!
Pupil: Anyway it is a lot. You need help teacher.