What are some non examples of a landform?

Oh, dude, non-examples of landforms would be things like a cupcake (unless it's a cupcake mountain, which would be awesome), a unicorn (unless it's a unicorn hill, which would be magical), and a smartphone (unless it's a smartphone canyon, which would be a weird place to lose your phone). So yeah, basically anything that's not a natural feature of the Earth's surface is a non-example of a landform.