When placing a source or lava (from a bucket of lava) in a spot that is already occupied with lava (both source lava and flowing lava) the sound of breaking a stone block will play, and odd particles will come out. The type of particles are the ones that you get from a broken block, however they feature the lava texture... As if you broke a block of lava!
Note that I was using 1.6 prerelease at the time!
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46th Duplicate of MC-18365, please use the search function to see if your bug has already been submitted. Currently over 57% of tickets are being closed as duplicate.