An agitated patient was stomping around the psychiatrist's office, running his hands through his hair, almost in tears.

"Doctor, my memory's gone. Gone! I can't remember my wife's name. I can't remember my children's names. I can't remember what kind of car I drive.
I can't remember where I work. It was all I could do, just to find my way here."

"Calm down...," said the doctor, "it'll be alright, now how long have you been like this?"

"Like what?"