Serious Issues:
* Fighting: A serious physical altercation or intense screaming match.
* Severe illness: One child is throwing up violently or experiencing a medical emergency.
* Significant injury: A child has fallen and hurt themselves badly.
Less Serious, But Still Annoying Enough:
* Uncontrollable mess: They've managed to create a catastrophic mess with snacks, drinks, toys, etc. – beyond the usual toddler chaos.
* Extreme whining/screaming: A relentless, high-pitched chorus of complaints that's driving the mom to distraction.
* Dangerous behavior: They're throwing things, kicking the seats, or otherwise behaving in a way that's unsafe for themselves or others.
* Intense sibling rivalry escalating: Beyond typical bickering, it's escalated to a point of distress.
* Forgotten essential item: One child is upset they left a critical item (like a beloved stuffed animal or medication) at home.
The key is that whatever is happening is disrupting the mom's ability to drive safely and/or is causing her significant stress and disruption.