 If you liked
Gintama
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 ...then you might like
Baka to Test to Shoukanjuu
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Well, gintama is random and parody on several animes and Baka test is random and a parody on several animes too and they are both funny, (in other ways though)! Gintama is sometimes a bit more serious than this one, but that's the only difference. I recommend both of them!