NO
Yes, because it is on your property, and is now your responsibility, since it is on your lawn, and not on theirs, it can be yours because it is on your property.
I cut the grass on my neighbors lawn for two dollars every three days.
you are
If you leave leaves in the fall on your lawn, they will die and you will have patches of dead grass on your lawn next season
No the neighbors pooped on each others lawn
No the neighbors pooped on each others lawn
mow the neighbors lawn
The care for your lawn before fall depends on where you live. For the most part you want to remove any plants that will die in the fall and keep your yard clean of branches so it is easier to rake leaves.
I have a civil responsibility to, for example, keep my lawn mowed and property presentable according to local laws. I don't have the responsibility to cut the lawn at City Hall, although I have the responsibility to pay local taxes to the city.
Stealing. Not funny at all!
You can mow the 5 inch strip if you feel you must, however do not trespass on his property to mow his entire lawn unless you have an agreement between the two of you that he does not mind you doing so.
Grass, Lawn knob, and Weeds