Gintama

My wife is a big fan of Gintama (which literally means silver balls), and if you don't get the joke kintama is the Japanese word for testicles (literally, golden balls). I don't really like the series, because it's basically a decently done rehash of the gags in "Sexy Commando Gaiden: Sugoi yo, Masaru san!" I noticed that one of the voice actors is Casharin from Sugoi yo, Masarusan, as well.

Anyway, Gintama does play a lot on Japanese cultural icons and ideals, and it provides a quick and easy way to fill you with all the Japanese info you never learned anywhere. The Gintama episode I'm watching right now has a simultaneous reference to Gamara (a crappy 60's Japanese monster) and Momotaro (a Japanese fairy tale).