Java 7 update 45, build 1.7.0_45-b18
Windows 7 64 bit

Replicate:
Put an armor stand in or near a water block, put any armor or mob head on the armorstand. Detonate a number of tnt minecarts in the water block next to the armor stand at exactly the same time so that the stand blows up. This will generate several copies of whatever was on the armor stand and/or several ghost copies of it which you are not able to pick up. Both copies and ghost copies can be picked up by a hopper and then be accessed by the player.

Demonstration:
http://youtu.be/vZQ6wQNreXc