Not about a doublegun, but when Clint Eastwood's "Dirty Harry" came out, my girlfriend and I were seated right behind a local old German immigrant gunsmith and his wife in the theater. When the villian serial killer Scorpio got the drop on Dirty Harry and told him to get out his gun, Clint pulled out his 8 3/8" barreled S&W mod 29 .44 magnum. Scorpio said, "My that's a big one. Drop it!" As soon as Clint dropped it and it hit the pavement, the now horrified German gunsmith exclaimed loudly in broken English, "Aw geez, he scratcha the blue!"