  We analyze Vaidman's three-path interferometer with weak path marking [Phys.
Rev. A 87, 052104 (2013)] and find that common sense yields correct statements
about the particle's path through the interferometer. This disagrees with the
original claim that the particles have discontinuous trajectories at odds with
common sense. In our analysis, "the particle's path" has operational meaning as
acquired by a path-discriminating measurement. For a quantum-mechanical
experimental demonstration of the case, one should perform a single-photon
version of the experiment by Danan et al. [Phys. Rev. Lett. 111, 240402 (2013)]
with unambiguous path discrimination. We present a detailed proposal for such
an experiment.
