Cant jokes

Why can't an orphan role-play Star Wars?

Because they have no one to play Darth Vader.

A boy went to a doctor, and the doctor said, "I can't treat you." The boy asked why, and the doctor said, "Because I'm a family doctor."

Why can't orphans use a phone?

Because they can't find the home button.

Some boy says 100000 digits of pi, and this other dude can't even remember the 1st one.

Why can't orphans cross the street? Because they can't go home.