In [Inception][1] when every one wake up in the airplane, **Saito** finally makes the call so I can understand he knows **Cobb** successfully planted the idea in **Robert**'s mind. But I don't understand why Robert doesn't know that someone else has planted the idea in his mind. Robert and Saito both go to three levels deep and get lost in limbo, so how does **Robert** not know that someone played with his mind? [1]: http://en.wikipedia.org/wiki/Inception