Ooooh I found a glitch! *minor special world spoilers* Super Mario 3D Land
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On Special World 4-3, right at the beginning are those weird spike enemies that flip flop.
Pass the first one, and hit the brick block on the right for a tanooki leaf, grab the leaf but as you do, hit the enemy as well. If you did it with perfect timing, you should see both the grow up and grow down animation.
I did this with Super Luigi, and he came out as a tiny luigi with a hat, that could be hit again to go to another small luigi without one. It's like the bowser glitch from SMB1.