Redline
If you're a Superjail fan who is aware of how broad the term "anime" can be, than I highly suggest you check out the movie Redline. It's a beauty of hand-drawn animation that moves in a similar way to Superjail, and it's fun from beginning to end. Definitely something to whet the crazy animation appetite while we wait for season 4.
http://www.youtube.com/watch?v=lM43iPZf8J8&feature=relmfu
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The question is, who wouldn't?