Ghost Items when editing the age value of a dropped item

When having an active repeating command block in your world with an /entitydata command that sets the age of @e[type=Item] to a negative value, for example: /entitydata @e[type=Item] {Age:-1}
and then using /give, it will still give you the item but it will also spawn a ghost item that can't be picked up.
It's still recognized by Minecraft as an actual item since /kill @e[type=Item] actually kills the item.

See https://youtu.be/w9lURmQg_pg