I'm a pretty big movie buff - hard to pick favourites, but generally anything by the Coen brothers, Kubrick or Wes Anderson I'm really into.
More on-theme for Armello, The Fantastic Mr. Fox is probably my favourite Wes Anderson movie.
O Brother, Where Art Thou? is my favorite Coen Bros. flick, and probably one of my favorite movies ever. It's also one of my top films that i have no trouble watching with my grandma, since she grew up in practically the same setting and relates to everything in it.
Also, Groundhog Day by the late, great Harold Ramis is another in my list I forgot to mention. Slipped under everyone's radar when it first came out, but I feel like it's become a lot more popular in recent years.
I have plenty of other guilty pleasure movies. The 60's is chock full of great, campy stuff like Batman: the Movie and the Planet of the Apes series. The latter is so ridiculous with its cheap sets and looney, radiated telepathic bomb-worshiping sewer people plots, but I still really like 'em. In fact, maybe that's why I like them (and as far as the new Ape movies go, I thought the reboot great). I tend to squeeze too much enjoyment out of Sci-Fi b-movies and poorly-dubbed Kung-fu flicks, too.