picture in your mind's eye the following: a box of razor blades and a roll of duct tape and your lawnmower laying upside down
now, picture this scenario happening in your mind's eye: you duct taping razor blades to your existing dull lawnmower blade
finally- for the finale- picture this scenario in your mind's eye (final mind's eye scenario of this post): you mowing your lawn and the mower is slicing through all of your grasses like a hot knife through butter. as each blade of the grass falls to its death, it has a smile on its face because you* took the time to invent the world's first razor blade lawnmower
*you = me in the above mind's eye scenario