Hide behind Dumbledore
From Create Your Own Story
DumbleDore steps aside and frowns at you. "Are you sure you should stay here potter? Im really concidering sending you home...and i dont send students home often here...but you are not the potter you once were? Dont you remember anything?"
After a while of thinking about this, DumbleDore turns to you. "Potter follow me please, i need to show you something." He starts walking up the long staircase and into a room full of moving pictures. There are pictures of him...as in an infant...with his parents his real parents! DumbleDore stares at you and waits for you to remember something...anything.
Remember but lie and say you dont and should get home. That he must be sick, you are not a wizard
Look up at him and shout with excitment that you remember it all so well now.