It works best if you are driving through the country side and happen to pass a field where the farmer has recently put up his hay, in these large, rounded bales.
"So," you say, "have you heard that the state of Ohio (fill in your state) has outlawed round hay bales?"
Your victim expresses some degree of surprise, or, ideally, asks why.
You: "They want to be sure the cattle are getting a square meal."
I told you it was bad.