Because nothing says, "I love you, mom" like hooking her up to a lie detector and asking her on camera if she's ever had a threesome.
You know your parents probably lied to you when you asked them if they did drugs. I certainly wish I could get the full story out of my folks about their younger years. One way to get this information is to build a relationship of trust and openness with your parents that leads them to willingly share these details with you as an adult. Or here's another solution from Distractify: hookin' your ma up to a lie detector and asking her about her dirty, drug filled youth.
If your mother's favorite brunch spot is all booked up on Sunday, I consider this a viable replacement option.