In part of the sketch he mentions turning a backyard koi pond into a peat bog. This statement is actually not impossible. Sphagnum sp. (peat moss) has the ability to change the acidity (pH) of the water in which it lives. It makes the water more acidic, which is better for the moss and usually worse for many of the other plants. Colbert did forget to mention that turning a koi pond into a bog will probably also kill all the koi.
If you are interested in cutting directly to the mossy reference it starts around 3:50min.
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