Unspecified Threats

Seen in my neighborhood while walking the dog. I like the vague threatening nature of the sign. And what is "it" that they will put on check? What is putting something "on check"? And what's up the strange use of quote marks? By the way, the first melt of the spring in Minnesota is when all the garbage and dog poop from the winter surfaces - it's pretty gross. But dont' worry - I always pick up after Whiskey girl. Unless it's in my own yard. Then I let her go wild!