Corby was eating lunch in her Kerobokan Prison cell when a group of journalists and photographers arrived outside the cell.
An angry Corby splashed the visitors with water, refilled her cup and splashed them a second time, before hiding inside a bathroom.
Corby, 32, was sentenced to 20 years' jail after she was caught at Bali's airport in October 2004 with 4.1kg of marijuana in her boogie board bag.
Since then her mental condition has deteriorated and in August last year she was judged by a top psychiatrist to be insane.
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"She is lost in her own bewildering world where fantasy, hallucinations and bizarre ideas dominate her mind," Associate Professor Jonathan Phillips said at the time.
