there is a bug of the placement of the water when a water source is placed on another it sounds like a broken rock and there are water particles.same for the lava.
Related issues
is duplicated by
Attachments
Comments

Confirmed.
Feature 😃
It also occurs when placing water or lava into a flowing water/lava block.
Added two screenshots showing this... Can someone tell me, why it is intended, just interesting? =D
P.S. And if this intended, then change of sound to some splashes would be good.
I just experienced this very bug(not really a big, imho, but more of a curiosity) several times while using 13w25c. The situation was placing water from a water bucket into flowing water and the rock breaking sound occurs for each water block that has leveled off to the same elevation as the adjacent water blocks. Can upload a video if requested-
i also have this bug!
same in my case

@Matteo Rainer : You can stop commenting and attaching files, this is not a bug, it's a feature. Read the comments.
It's really not a bug that the water block breaking sounds like two blocks of cobblestone breaking?
My brain can't compute how is this a feature.
My brain can't compute how is this a feature too. so maybe someone can explain us?
Minecraft can lack realism but this!
Love how Mojang was the 2nd comment on this saying its a feature and yet everyone keeps commenting on it saying its a bug
Maybe if they changed the sound? A splashing noise would make more sense to me than a block breaking sound.
"This not a bug, it's a feature!" = Nonsense.
It's Mojang's game. They can do whatever they want with it.
We decided that this wasn't as much of a good feature because of a lack of proper sounds (also fixed another nasty bug ;D). So no more particles/breaking/sounds when placing liquids into liquids.
Just noting:
I'm still seeing this issue in the offical release (1.6.1) but its not just placing a sourse block into a source block. I actualy placed water into flowing water (no source) and I still got the broken water particles and the stone sound playing.
It also works if you place water on fire in the nether
did the bug then it crash minecraft cant load particle water