Kota: A 36-year-old mentally-unstable man was killed allegedly as a result of a bizarre prank in R K Puram area here, police said on Wednesday.

The victim, Munesh Kumar, yesterday was playing pranks with a mechanic Krishan Murari (25) at the latter's shop in a drunken state, they said.

Goaded by the pranks, Murari inserted an air pump pipe, used for filling tubes, in Munesh's rectum and switched on the compressor, Assistant Sub Inspector Kalyan Singh said, adding the victim fainted on the spot as air filled up inside his stomach.

He was immediately rushed to New Medical college hospital where he died during the treatment, Singh said.

A case under section 304 (Culpable homicide not amounting to murder) of the IPC was registered against Murari, the ASI said, adding that the accused was arrested also.