Updated

We've seen the fourth-quarter comeback. We've seen the colorful socks.

We've heard about the studiousness and the leadership. We've heard the disarming jokes.

Where does one stop and the other start? For Robert Griffin III, it's a well-defined line.

The Washington Redskins rookie quarterback says he "can't be 'on' all the time" or else teammates would get discouraged.

Not everyone knows when to be goofy and when to be serious, but the Redskins say Griffin already has it down pat even though he's just arrived in the NFL.

The Redskins are 2-2. They host the Atlanta Falcons on Sunday.