Sheldon: So, if a photon is directed through a plane with two slits in it and either is observed, it will not go through both. If it's unobserved, it will. However, if it's observed after it left the plane, before it hits it's target, it will not have gone through both slits.
Leonard: Agreed! What's Your Point?
Sheldon: There's no point, I just think it's a good idea for a T-shirt!