  Interpretations of quantum mechanics (QM), or proposals for underlying
theories, that attempt to present a definite realist picture, such as Bohmian
mechanics, require strong non-local effects. Naively, these effects would
violate causality and contradict special relativity. However if the theory
agrees with QM the violation cannot be observed directly. Here, we demonstrate
experimentally such an effect: we steer the velocity and trajectory of a
Bohmian particle using a remote measurement. We use a pair of photons and
entangle the spatial transverse position of one with the polarization of the
other. The first photon is sent to a double-slit-like apparatus, where its
trajectory is measured using the technique of Weak Measurements. The other
photon is projected to a linear polarization state. The choice of polarization
state, and the result, steer the first photon in the most intuitive sense of
the word. The effect is indeed shown to be dramatic, while being easy to
visualize. We discuss its strength and what are the conditions for it to occur.
