According to this story on Yahoo News:
An outing of luxury sportscar enthusiasts in Japan ended in an expensive freeway pileup — smashing a stunning eight Ferraris, a Lamborghini and two Mercedes likely worth more than $1 million together.
Thankfully, no one was hurt, but it appears that one driver caused nearly a million dollars in property damage.
Speaking of property damage, this is the third number in your liability coverage, if you have split limits like 100,000/300,000/100,000. Typically this section covers this kind of incident, say if you were to run into someone else's car or other type of property.
Of course in this scenario, we hope the driver that ultimately caused this accident has a much higher limit and an umbrella!