Java Edition:Skull Replacement
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From 1.7.6-pre2 to 1.7.10, skulls could replace any block without causing an update when placed on an incomplete block.
Obtaining
From 1.7.6-pre2 to 1.7.10, skulls placed beside or on top of an incomplete block, such as a trapdoor or stairs, would replace any block in its location and not cause updates to surrounding blocks. This method cannot be used in the downwards direction since no skull will be placed.
This bug allows for unbreakable block removal, half door block, half bed blocks, support requiring blocks on skulls, and other discontinued block configurations.