A doctor and a father

One day,

A man come to the doctor that he have met last 2 month, about how to control pregnancy to control the quantity children that he already have. At this time he has about 13 childs. He remembered on how the doctor told him about the easiest method to control birth and pregnancy by using condom, and now he come angrily to ask again about this method after he is mentioned by the doctor in his town that his wife is pregnant 2 months old.

Father: Hi Doctor, I am really2 mad at you doctor. I remembered that last two month, by using the method that you explained to me, i can control having more child. But now, i ve got news that my wife is once again pregnant.

Doctor: Have you do what how i have told you before on the method of having sex by using condom?

father: Yes. Of course, I remembered and i have done as what you have explain to me.

Doctor: (Confused). Do you checked the condom if there is any leaked?

father: No. Ive checked it with my own eyes.

Doctor: Can you show me, how do you use the condom?

father: I have thought that you will ask me. I have bring one. Here i show you (while putting it on his right pointing finger) Here it is. Right on my finger SAME AS YOU TOLD ME BEFORE.

Doctor: Now i get it (while scratching his forehead)