Someone recommended Waterboys - I second that. And if you'll like it, you can try Swing Girls from the same director.
Ouran High School Host Club - it's not as good as anime, but still funny
Yankee-kun to Megane-chan
Otomen
Sukiyaki Western Django - it's from Miike so it's kind of weird, but I if you like Miike's humor....
Meitantei no Okite - it's parody on detectice stories
700 Days of Battle: Us vs. Police - nice movie about highschoolers who don't have much to do during summer break
Nodame Cantabile - it's very funny and very anime like (even though I haven't seen the actual anime)