I've been mowing big lawns (5-20acres) for some years, now. One of my practices has been to mow whatever's on the grass. I mow beer bottles, plastic bottles, beer cans, drink cans, fallen tree branches (up to maybe 2" diameter), etc. Doesn't seem to hurt anything. I swap out sharpened blades every few days anyway, so that's not an issue. When I mow a lot of downed branches, I get lots of loud bangs from the deck. I've always assumed this isn't really hurting anything, as long as things keep going good. Every so often, I hit a big branch or chunk of wood just right and it shuts the mower down cold. I have had these instances knock a belt off the deck. Now, obviously this isn't good for the machine. Yes, it would be nice if someone had gone over the area before I get there and picked up all the junk laying around. But, since that rarely happens, the answer is: mow what's there. Just curious if you guys do that, too, and if it's as harmless as I hope it is to our eqpt. I don't have any evidence to the contrary.