What I expected to happen was the anvil would fall, breaking the flower structure.

What actually happened was the anvil did not break the flower structure and instead, when I broke the flower structure, the anvil floated.

1. Place a sunflower, lilac, rose bush, peony, double tall grass, or large fern anywhere.
2. Place the anvil on top of the flower structure.
3. Break the flower structure
4. Enjoy your new ACME Co. Floating Anvil of Floatiness!
(This works in creative, survival, and adventure game modes)