I had the dubious distinction of never having seen ANY of the SW films in their entirety before this year.
When Sith came out, I decided to rectify that problem.
I went and bought the trilogy package plus Episodes I and II. I watched Episode IV and part of V on Friday night. I watched the rest of V, VI and part of I on Saturday night. I finished I and watched II on Sunday, then went to see III in the theater on Sunday night.
Six movies in about 48 hours.
Pretty cool, actually.