AH I've had a few break over the years. They will scare the crap out of you. This one was the biggest I've ever had, sometimes you can tell when they are about to break as they go chink chink chink as they spin, this one just went BAM and broke. I've never had one come out of the machine but have heard of others who have and it's not a pretty sight.
Raven
I've had to clean out 3 nests this year in my truck engine compartment, luckily the little bastids haven't chewed anything. yet.