No, that's not it

A general noticed one of his soldiers behaving oddly. The soldier would pick up any piece of paper, frown and say: "That's not it."

This went on for some time, until the general arranged to have the soldier examined.

A military psychologist concluded that the soldier was deranged and wrote out his discharge from the army and handed it to the soldier, who picked it up, smiled and said:

"That's it!"