The Perfect Movie Scene

Pick something you think just works perfectly. Sometimes a crap movie has a great scene that just works, sometimes a great movie has one scene that really stands out.
I just watched The Third Man again (maybe my favourite movie) and this is just perfect:
If one of those dots stopped moving forever
But, yeah- an action scene, some comedy. Just whatever you think is the best single scene you've ever, erm, seen, or at least comes close.
I just watched The Third Man again (maybe my favourite movie) and this is just perfect:
If one of those dots stopped moving forever
But, yeah- an action scene, some comedy. Just whatever you think is the best single scene you've ever, erm, seen, or at least comes close.