I can't believe this is really a thing!
http://www.dailykos.com/story/2015/07/20/1403570/-A-New-Southern-Wedding-Tradition-Yes-I-Wish-I-Was-Kidding
Of course, even without the huge safety issues, I'm wondering how it is a symbol of "unity" to have the bride and groom shooting guns. But in any event, you really don't want to be killing some innocent third party at your own wedding.