 If you liked
Sayonara Zetsubou Sensei
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 ...then you might like
Kuuchuu Buranko
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Both anime are crazy comedies about psychological issues. They include playing with different types of animation and are drawn in an uniqe way.
Unique and new, at times even strange or crazy, animation, offbeat stories and characters, and most importantly people with odd psychological problems.
Black humor oriented shows that usually deal with medical psychology in both internal and external factors, they only differ in settings but has the same episodic routine. They also both eccentric art style and witty figurative symbolism, though SZS relies more on parodies and reference KB does it less.