Suggestions?

Tonight we went grocery shopping and happened to leave our back "patio" light on. When we came back six jr high/high school aged boys are playing football in our backyard. Not our side yard, but OUR back yard. I didn't know what to do. I just stepped back there and stared at them for a minute. Allen was carrying groceries. We went inside and turned the light off. Of course they had to move because they couldn't see back there any more, but what do you think? Do you think that turning the light off was a neighborly way to say get the heck out of our yard? Was it enough? Should we have said something? What should we do the next time? Suggestions can be left in the chat box. Any and all will be appreciated.

P.S. I am certain some of the boys left with dog poop on their shoes, as they were playing in OUR backyard that Penny poops in....