I find this happens occassionally and it's kind of irritating. Basically what I think happens is the neighbor sees me more often than they see their neighbor and wants me to do something different to the customers yard. Then it's like I have to be the messenger and tell the customer, but I basically tell the person the same line everytime. I say well I won't do any work without the customers consent. I think maybe they can't get the neighbor to trim something or whatever and they're hoping i'll just do it real quick thinking i'm dumb. NOT gonna happen. I've even had customers want me to go work on properties that they didn't even own themselves. Who do you think is going to get in trouble? ME duh!