Ari Weinkle's experimental typeface "Feelers" is inspired by the movements of animal appendages, and each letter does look alive. In fact, the look like they might squirm inside your body and start spelling out commands.
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You can watch the alphabet below, and you can also see all of the animated GIFs at once at Tumblr — and the still typeface on Weinkle's site. I imagine it's a distracting typeface to read, but a fun one to play with.