How can one talk without saying a single word?

Two boys were admitted to a school. When the headmaster asks them about their parents, they tell him that they have same parents (father and mother). On further inquiry, it turns out that they both share the same date for their birthday.

"Are you twins," ask the headmaster.
"No," replies the boys.

Is it possible?

I am a type of word that is spelt incorrectly or used differently, on purpose for humour. What am I?
Hint 1: You can find me in a joke.
Hint 2: I am a play on words.

Which is the correct shadow of the bird?

Two in a corner, one in a room, zero in a house, but one in a shelter. What am I?

I can be cracked, made, told, and played. What am I?

Can you guess the name of the month by looking the below rebus ?

One night, Louis and Adam were sitting together. Adam was watching a movie while his wife Louis was reading a mystery book. Suddenly the power went out and Adam decided to go to bed, but strangely Louis kept on reading. There was no artificial light around, so Louis kept on reading. How come?

Which wheel of car does not rotate when you turn your car right?

You see a boat filled with people, yet there isn’t a single person on board. How is that possible?