"You knew at the time. You just forgot afterwards. The year was erased. The year that never was." The Doctor shrugged, looking off to the side and lifting a hand to pinch his earlobe between two fingers. "Usually only some know. But some people know of the Doctor. If you get high enough, deep enough." He made a face. "It's usually better when they don't know."

For a moment he paused, then he continued. "They only tend to notice when I can't save everyone."