Iconic movie moments that were improvised

A good script is supposed to have incredible moments and carefully crafted lines, but sometimes it takes an actor deep in character to fill the space between the lines with realistic, memorable moments that were born solely from the momentum of the scene. Sure, improvisation doesn't always work out, and many unscripted scenes have been cut from the final product, but when it does work, it has proven to be legendary.Take a look at these famous scenes that were improvised by actors.