One of my high school teachers had a rule that any time he called a student by a sibling's name, they got a point of extra credit. It happened most class perio

One of my high school teachers had a rule that any time he called a student by a sibling's name, they got a point of extra credit. It happened most class periods to somebody, and that was with him being very deliberate about asking people to point it out and trying very hard not to do it.