Today I'm mowing for a customer I've had for 15 yrs. One of my very first. On one side of him is another customer, on the other a couple that I've done limited work for. This couple, elderly, have always been very friendly: waving, chating etc. I finish cutting the front and head for the back yard. There's a tight little corridor between the customer's and the elderly couples side yards that I'm able to squeeze through with my 48" Toro. A big oak on one side and a shed on the other. It's really the only way to get back there because on the other side is a steep hill to climb. Anyway, when I get to the corridor I find a landscaping timber blocking the way. I move it and proceed to cut the back. I had to dump the grass and come back for a second time to finish the back. What do I find? You guessed it: the timber has returned. I get off the tractor and move the timber again. By the time I'm back on, the elderly gentleman is there screaming that this is his yard. Eyeballs and veins popping out. I kept going while he proceeded to try and kick the timber back in the way. Keep in mind, I've been cutting and going this same way for 15 yrs. and now this guys getting territorial. I don't have a clue what his problem is. Also its I'm not convinced its his property and even if it were I'm not doing any damage. Sorry to be so long winded but I needed to get it off my chest.