> CCing the world

Back at a previous place of employment, every Michaelmas term, one or more of that year's bunch of freshers would use the wildcard facility of the campus e-mail system to send out a naiive query to everybody on site. Said system would then promptly melt down under the load of old farts being loudly annoyed, and showing they didn't know how to *not* Reply To All. Most frustratingly, there was a flag available to centrally disable wildcarding, but Management refused to have it set.

.... which (back at the subject) is as good a demo as I've ever seen of the expression "blast radius". SHOUTING merely compounds the offence.