"Your Highness" (R, 102 minutes). A juvenile excrescence that feels like the work of 11-year-old boys in love with dungeons, dragons, warrior women, pot, boobs and four-letter words. A promising cast (James Franco, Natalie Portman, Danny McBride, Zooey Deschanel) in one of the worst films of the year, a witless farce set in medieval times and featuring a curious obsessions with adding obscenities to every sentence.