Mom A: "Oh, I do need to ask before I bring the kids over, do you have guns in the house?"
Mom B: "Why, no!"
Mom A: "Hm. So if something bad were to happen, you'd be helpless to protect my children until the police got there? I'm sorry, I really think I need to cancel..."
Although I don't think that's exactly what the grass-eating pants-wetters at ABC meant when they said 'Before Arranging Playdates, Ask About Guns'.