This is an easy pick. Before Sunset. It’s very simple but oh so perfect.
Here’s a clip of the scene in question, but obviously, SPOILER ALERT! Seriously. Don’t watch this unless you’ve seen Before Sunset. No, you can’t watch it even if you have no intention of ever watching Before Sunset. The scene will mean nothing to you anyway. And while we’re at it, don’t watch Before Sunset unless you’ve seen Before Sunrise already. There. The law has been laid down.