 If you liked
Toaru Majutsu no Index-tan Movie: Endymion no Kiseki - Ga Attari Nakattari
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 ...then you might like
Hentai Ouji to Warawanai Neko.: Henneko BBS
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Both are a compilation of animated specials that provides a secondary, more humorous perspective on their respective parent story. Both are relatively short in length and should be watched after watching their parent story. Furthermore, Henneko BBS and the Endymion special are both made and released by J.C. Staff, so the artwork and the quality have a lot of matching parallels.