"I believe it's possible for you to believe you are one," the Doctor explained. "And it's certainly possible for you to have abilities that would make that belief, well, believable. I've seen many strange things in my travels, my good man." He couldn't even begin to describe them all, and he was still young! There was so much more to see! Oh how he hoped to get his ship back...

"That's good! It still lingers, though, does it?" False memories that stuck around didn't seem very appealing to the Doctor. He couldn't imagine them being comfortable for anyone else, either.