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Radio jets in active galaxies have been expected to interact withcircumnuclear environments in their early phase evolutions. By performing themulti-epoch monitoring observation with the KVN and VERA Array (KaVA) at43~GHz, we investigate the kinematics of the notable newborn bright componentC3 located at the tip of the recurrent jet of 3C~84. During 2015August-September, we discover the flip of C3 and the amount of the flip isabout 0.4~milli-arcsecond in angular scale, which corresponds to 0.14 parsec inphysical scale. After the flip of C3, it wobbled at the same location for a fewmonths and then it restarted to propagate towards the southern direction. Theflux density of C3 coherently showed the monotonic increase during theobservation period. The flip is in good agreement with hydrodynamicalsimulations of jets in clumpy ambient medium. We estimate the number density ofthe putative clump based on the momentum balance between the jet thrust and theram pressure from the clump and it is about $10^{3-5}~{\rm cm^{-3}}$. Webriefly discuss possible origins of the clump.

Evidence of jet-clump interaction: a flip of the radio jet head of 3C~84