Double-J

Same author, so similar style of humour with the punchline coming at the very end. Both are shorter than normal anime, too (4 or 12 min.) 

Both are pretty much the same: both are about highschool girls talking and doing random things, and both are short and school comedies. However, in Morita-san, there is more animation while in Double-J, there is really little animation expect the ED. 

Both are art clubs which has girls. Personally, I prefer Double-J. But they are really similiar. 

Both feature short episode runtimes. Both have an absurd brand of humor. And they're both quick and easy to consume, like a sort of comedy-anime fast food.  

Same 4-minutes-long episodes, same funny brainfucking dialogues, same crazy jokes. Drawing styles are also somehow similar. If you enjoyed honto no atta, you'd definitely like double-j. 

Same company doing with the same flash anime style. 

Fast-paced nonsensical five-minutes long high-tension comedy. Complete with easy-going student artwork style and quick-speak voicing, everything in both shows fits the description of high-tension comedy you often found in Japanese comedic content. Double J story is written by comedic genius Nonaka Eiji of Cromartie high school, he is great with historical and cultural reference. While GMB is written by Masuda Kousuke, who write faster-paced script, but with no less historical reference, pop-culture parodies and boke-tsukkomi jokes. 

Story by an established comedy writers, art by an unknown moe artist. Both show are anime adaptations of such manga, with average moe art that appeal to anyone, and wacky story by surreal comedy writers. Animation wise not everything in the nutshell looks similar. Double J take a "student project" kind of art direction while Joshiraku is relatively mainstream. They don't share VA cast. They are not even in the same league. Joshiraku is a full-length TV series while Double J is animated short with 3 minutes per episode at best. Should avoid comparing production quality of the show with different budget at all cost, it just not a good thing to do. So it comes down to story, both shows are similar if and only if you take a good look at the jokes they throw around at each other. read more 

Ishida to Asakura has a ridiculous level of randomness you could never expect from an anime. It's too random, it's more like Youtube recommended playlist for naked people on drug wearing tinfoil hat backward walking dog while running cat. It's pretty difficult to say that some anime is different from the other with all overhype we have, but this one IS different, and I use that term very sparingly. That term is subjective alright, but if you trust my portfolio and like ridiculously random unexplainable phenomena which breaks all archetype, go watch it. Double J is anothere kind of fun. While not madly random, feature a healthy amount of punny fun time. The show also make fun of usual club-activity setting as seen in K-on like anime too. If you want to take a little break from commonplace setting, this is for you. Too bad, the ridiculously short episodes are never enough to satisfy the hunger of mad fans. read more 

Both anime's come form the same producer Tani Higashi. The animation/art style is the same, and the comedy is on the same level also. They are classified as short anime's but despite that they are very entertaining.