People have already pointed out Pulp Fiction.
Batman Begins was good, but there's no way it's in the all time top five.
Forrest Gump shouldn't be as high as it is.
Lawrence of Arabia ought to be higher--it's too long for today's audiences but for about 30 years after it came out it made a lot of top 10 lists.
Network still holds up and ought to be higher but I don't think it's as well known as it ought to be. Best speeches in any movie.
Bourne Ultimatum isn't even the best in the Bourne series.