I usually wait for movies to get aired on free tv channels, and so I'm always a few years behind in new films. I haven't seen most of the old classics like Casablanca, Citizen Kane, Gone With the Wind (all I had to do is check how long it was and run away), Lawrence of Arabia, anything by Kurosawa (almost never shown)... the list goes on. Newer examples include Titanic, Schindler's List, and Münich (which gets shown actually quite often, but I always skip it for some reason). Haven't seen The Room (why would anyone-), but I have seen Plan 9 from Outer Space! Now that's what I call a masterpiece!
Not avoiding them or anything really, but there's no time for every freakin' thing out there, is it?