  Radio jets in active galaxies have been expected to interact with
circumnuclear environments in their early phase evolutions. By performing the
multi-epoch monitoring observation with the KVN and VERA Array (KaVA) at
43~GHz, we investigate the kinematics of the notable newborn bright component
C3 located at the tip of the recurrent jet of 3C~84. During 2015
August-September, we discover the flip of C3 and the amount of the flip is
about 0.4~milli-arcsecond in angular scale, which corresponds to 0.14 parsec in
physical scale. After the flip of C3, it wobbled at the same location for a few
months and then it restarted to propagate towards the southern direction. The
flux density of C3 coherently showed the monotonic increase during the
observation period. The flip is in good agreement with hydrodynamical
simulations of jets in clumpy ambient medium. We estimate the number density of
the putative clump based on the momentum balance between the jet thrust and the
ram pressure from the clump and it is about $10^{3-5}~{\rm cm^{-3}}$. We
briefly discuss possible origins of the clump.
