When you have a child and you enlist the help of someone you either do not know, or barely know to change their soiled diaper. Typically a male.
Nick: Hey Steven, Abbey has a dirty diaper and I'm indisposed at the moment killing 8 year olds on COD
Steven: I would, but are you sure you want to have a stranger change her?
Nick: I completely forgot you were a stranger changer, thanks for reminding me.
Steven: No biggie, the judge said I'm legally obligated to inform any nearby parents anyway.
Nick: Is that why we aren't allowed at Chuck E Cheese 's anymore?
Steven: Yeah, one of the reasons.