There were 2 40+ year old oak trees that had not seen any pruning during their lifetime. They had grown over the back fence of 3 different yards, and were making quite the mess in those yards.  We set to work clearing one yard at a time. We ended up pulling out 7500 lbs of oak tree from those 3 different yards.  All the neighbors were incredibly happy and were excited to be able to enjoy their back yards without the overgrown mess.