  For the "stealth bosons" $S$, light boosted particles with a decay $S \to A A
\to q \bar q q \bar q$ into four quarks and reconstructed as a single fat jet,
the groomed jet mass has a strong correlation with groomed jet substructure
variables. Consequently, the jet mass distribution is strongly affected by the
jet substructure selection cuts when applied on the groomed jet. We illustrate
this fact by recasting a CMS search for low-mass dijet resonances and show a
few representative examples. The mass distributions exhibit narrow and wide
bumps at several locations in the 100 - 300 GeV range, between the masses of
the daughter particles $A$ and the parent particle $S$, depending on the jet
substructure selection. This striking observation introduces several caveats
when interpreting and comparing experimental results, for the case of
non-standard signatures. The possibility that a single boosted particle
decaying hadronically produces multiple bumps, at quite different jet masses,
and depending on the event selection, brings the game of anomaly chasing to the
next level.
