Not a tree thing but I once was behind a combine and thought I could do something before my dad backed up.
Dad backed up combine at  good speed and I was on a jd4020 narrow front with a 158 loader. I tried to get out of way but my gear shift jammed.
Dad hit me on the loader bracket almost tipped me over as the  the rear end of the JD 7720 combine hit and jumped into the air.
My fault and I should not have been there.. Words were exchanged but I knew it was my fault.