Egon ... your comment is worthy of a thread all it's own. The CEO at my stake, who has no trouble berating the task of mowing 3 acres of finish lawn and 3 acres of field grass as mundane and a 'not work' task, has no trouble leaving all types of hazards, some hidden for me to uncover before the blade tips or spindles find them. Let's list a few.
1. Dog ties - those green plastic coated steel 20 foot lines used to tie up the dogs (and/or goats in my case). I've never hit one of these with the mower yet, but if I do, I'll be at a minimum maimed and the deck will be toast.
2. Hoses. We have a total of 600 feet of garden hose divided by 3 locations at any one time. Every time I mow, I have to collect them. I have a separate box of hose joiners in the garage because I'm always making splices after mowing.
3. Every year, a new crop of crocus, daffodil and iris find their way to a piece of grass I used to be able to mow in early spring.
4. A new tree or a new raised bed - it's a continuous struggle to locate these - her agenda is where it looks nice, mine is where it won't become yet another 'thing to mow around'....
I could continue, but I shant.