Be nice! Have you ever seen someone really hit with a driver? I saw my buddy (240lbs.) take one to the head! He dropped like a sack of potatoes- didn't get up for a couple minutes Now on the dog poop issue... I yell at full volume for them to pick it up, sometimes offer a spare bag or even explain how it gives other dog owners a bad rep. If that doesn't work I threaten that I will throw it at them or have my dog eat their dog (I have a rotty named Brooklyn!). That goes for anywhere, not just courses- I once feed her burritos so she could get my point across to a nieghbor who didn't get it!