A woman went to the school to register her boys.

The office worker asked her,

-- How many children do you have?

-- Ten.

-- What are their names?

-- LeRoy, LeRoy, LeRoy, LeRoy, LeRoy, LeRoy, LeRoy, LeRoy, LeRoy, and LeRoy.

-- They're all named LeRoy? What if you want them to come in from playing outside?

-- Oh, that's easy. I just call "LeRoy", and they all come running in.

-- And, if you want them to come to the table for dinner?

-- I just say, "LeRoy, come eat your dinner", and they do.

-- But what if you just want ONE of them to do something?

-- Oh, that's easy. I just use their last name!