When trying to put a shulker in a minecart it starts twitching around. When moving the minecart further away from the starting point the shulker seems to be teleporting inbetween the minecart and it's old position. When ejecting the shulker it doesn't always go back to it's former location. Sometimes it can end off a few blocks further away
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Also occurs in 15w31b.
Not shown in these screenshots is that the shulker appears to teleport rapidly between it's original location, that of the moving entity, and a point half way between these two. All three versions of the shulker have a bounding box, but only the shulker on the moving entity blocks movement or takes damage.
Also, bounding box of shulker obscures that of minecarts, making breaking of minecarts impossible. Larger entities such as cows & horses can still be hit whilst being ridden by shulker.
Sethbling did it during a livestream he did earlier today <http://twitch.tv/sethbling>. This probably has something to do with how the shulker's location is stored.