Some things found while tilling "cleaned or clear" spots for neighbors. While tilling a rather large garden spot for an older widow neighbor her son had "cleaned up" about 3 passes into it I figured out where her late husband left two rolls of barbed wire fence. The slip clutch worked, but not intill I had both rolls well tangled. Another neighbor called after setting up a double-wide and asked if I could till the future site for a lawn, No problem I says. I looked over the piece of ground, picked out just a few rocks and started till'n. After about half way being done, found where the backhoe had buried in a very shallow grave, the remains of a brick chiminey. Slip clutch worked as the red bricks bent tine flanges and jamming between tines and top of the tiller, all in the blink of an eye. If I have not tilled that exact spot before or put'n in a new garden, I rip the spot with the cultivator first, in both directions. Experience is the best education, neighbors or not.