Gravity bends a light beam more than a particle beam. We show how elevator occupants can use that fact to determine whether the forces they feel are caused by a gravitational or non-gravitational acceleration. I.e., although that capability supposedly violates the ‘Equivalence principle’ of ‘General Relativity’. Einstein imagined "the experiences of occupants in a windowless chamber, in deep, isolated space" as it was ‘accelerated upward’ by a pulling. And claimed ‘Equivalent’ (identical) feelings and test results would arise for occupants in a non-moving elevator on our gravitational earth.[1] Yet, let us imagine that a photon and an ultra-high-speed particle are launched at the same time from an internal wall of an elevator; then they go through two adjacent pin-holes, and finally hit the opposite wall. But surprisingly, they do not hit the same spot - because the gravity bends photons twice as much as a particle beam.[2] So we discuss that violation of ‘Equivalence in Relativity’ and its broad implications, in this article.