There are few things that offer the level of personal bonding, loyalty, and intoxicating joy as a growler. Dogs come close, but they also crap on your floor after eating way too many treats in Thrillist taste-tests.
So how did those Big Gulp-sized beer transportation vessels get their name? Nobody knows! Beer investigators have been chasing their tails for years, and, although there's no conclusive evidence, there are a few popular theories worth learning for National Growler Day.