Johnnie wants to marry

One day Little Jonnie says to his father:

I want to get married.

Father: Oh, so do you have someone special in your mind?

Johnny: Yes...Grandma

Father: What? There is a problem now; you want to marry my Mother?

Johnny: Why not? You married my mother

How dumb can dumb be?

A couple walking in the park noticed a young man and woman sitting on a bench, passionately kissing.

"Why don't you do that?" said the wife.

"Honey," replied her husband, "I don't even know that woman!"