I have probably broken more glass carboys than most of you have owned either. Have me over anyway and red plastic "party cups" will suite me fine.
I've only ever had one carboy broken, one of my 12 gallon ones (empty). It was my wife who broke it, kind of a Rube Goldberg chain reaction with a moving garage door, a 2x4, a chair, a broom, and a carboy that would have been just fine if nothing had shoved it off of the top of the stack of brewing equipment. No injuries. I still have 11 glass ones that are 5+ gallons.
I've had more full carboys stolen (4) than many people own.
If you're ever over for a pint major, you'll get glass. If you break it, we'll get the broom and a clean glass.