Sorry to hear, and glad there were no casualties other than the carboy. Got me thinking; I'm setting up my new pump and plate chiller, tossing in a Hop Rocket as well, and I also use glass carboys.
Seems there will be a bunch of hoses laying about during the chilling process and this type of accident is bound to happen if the carboy is just sitting there empty - light enough to be knocked over easily.
Thinking I might put the empty carboy in a crate or other device to hold it securely and protect it from such a mishap.
See? Something good DID come from this. Thanks!