Stranger Danger!

So my office is above a pediatric office and yesterday I hear a mom and her little boy come in the front doors. He is obviously resisting as she tries to get him to go down the stairs. Eventually he starts saying (in an escalating tone) "You're not my mommy! You're not my mommy! You're not my mommy!" Then I can hear her embarrassingly start to chuckle and say "Oh yeah, then what am I?" I bet at that moment she wished she wasn't his mommy! Note to self: teaching your kids stranger danger can backfire...