Total brightness image of the solar corona acquired with the Metis coronagraph on February 22, 2021, at 20:55 UT. This observation caught one example of the wave-shaped plasmoids, which were detected while propagating in the FOV of the coronagraph at PA ≃250°, compatible with the switchback phenomenon. The inset panel presents a zoom of the region bordered in red in the larger figure. A movie of the full frames of the Metis observation sequence, available online, shows the phenomenon more clearly.