The YouTuber Tom Scott did a video shot in the style of a music video that was really interesting, and one of the things that surprised me was how little of the video was shot using the "right" frame right - for example, they shot dancers at a slightly slower frame rate then speed the footage up to make them look more in sync, or slowed other shots down to make them feel more dreamy. But only fairly subtly, so that you don't necessarily notice it if you're not looking for it.

There's definitely something fascinating about playing with playback speeds.