If you are in Minecraft, survival or creative.
And you place a barrier block 2 blocks above the block where you are standing of. And you place a lava block on it.
If you will walk under it, it looks like you are standing in de lava, but you are not getting damage.
Demonstration: http://youtu.be/tgb-wL4GoIUMo
Linked issues
duplicates 1
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I will post an image because MC-47520 isn't the same, there it is going about an slab, this is with an Barrier block.
Updated MC-47520.
Duplicate of MC-47520 - If you have not, please use the search function in the future, to see if your bug has already been submitted. If you could not find the original report, please comment with the keywords you searched for.