In an early scene from Who Framed Roger Rabbit, an animated pelican cycles through a live-action studio lot. The production did not animate the bicycle. The crew put a real one on the ground, filled its wheels with water to give it stability and pulled it along a hidden cable; the pelican was drawn in afterward. The production detail and original clip
It is a tiny, delightful example of effects work choosing the physical solution where it would look best and spending animation on the impossible part. The shot lasts seconds. Knowing how it works makes it more charming, not less.