"What would your mother say?"

Whenever Laura does not approve of something I do, she scolds me with "What would your mother say?".  Or she threatens me with, "I'm telling your mama!"  Or in some cases, both.

Me (weighing myself on the scale): Oh, that's not good.
Laura: What?
Me: I guess I should stop eating all those peanut M&M's at work...
Laura: Jackson! What would your mother say?!
Me: Probably something like, "You're going to share that bowl with your whole team, right?"
Laura: I'm telling your mama!