OK. The lawnmower was secured (with a Kryptonite lock) to a tree late last summer lock to prevent property redistribution. The key was then lost for the next 9 months and lucky for us, most of this time was fall and winter. Then came spring, and rain. Finally today, the key, having been hiding in the bottom of a dish, serendipitously resurfaces like a daylily. Then, 15 minutes into pushing the mower through foot high grass we encounter one of the many boulders lining our raised beds and KAPOW, THUNK. DUH.
All of which leaves me to believe that unless it's getting you high, grass is really stupid.