With all the Japanophiles wandering around people tend to forget that there was an incredibly strong code of honour known as Chivalry in West Europe that was pretty much as strong as Bushido, with slightly less emphasis on suicide for minor misdemeanours. (Recently found out that the 47 Ronin story, which I was aware was loosely true, started because their lord was tricked into drawing his sword in a castle in Edo, and had to commit suicide for it.)
That and Western noblemen would duel over matters of honor just as frequently as any samurai. And in all of history, I can think of no better way of starting a fight than throwing a glove at somebody in public.