Have a civil war happen for the stupidest of reasons

A Modena citizen goes to Bologna and steal the bucket ? The que have riots in both sides. And The things escalate fast, bonus Point this happen after they WW1 but before The March to Rome
 
I recall there a stand-alone Batman comic where it was revealed that, as a young man, the Joker had been driven insane because he found out that World War II was fought over the price of oil in German street lamps. (How he managed to combine being insane with being a for-profit criminal was not explained.)
 
What could be the stupidest reason a civil war could break out in any country?

How about this one (admittedly before 1900)?

"Let's bombard a fort that is no menace to us whatever, and is of purely symbolic importance--and thereby unite the North against us. And we'll do that in spite of warnings from our own Secretary of State that 'It is unnecessary; it puts us in the wrong; it is fatal.'" https://en.wikipedia.org/wiki/Robert_Toombs

I think that would qualify...
 
Not technically a civil war, but close: in the 1995 film Canadian Bacon the war erupts essentially because someone at a hockey game insulted Canadian beer. From this, a Pils vs. Weissbier civil war in Germany is not impossible to imagine, especially when a glass of it cost a trillion marks.
 
Welcome to the Constantinople riots of 532; a brief civil war caused by chariot racing hooliganism.

Which Chariot team you supported?

The team associations had become a focus for various social and political issues for which the general Byzantine population lacked other forms of outlet. They combined aspects of street gangs and political parties, taking positions on current issues, notably theological problems or claimants to the throne. They frequently tried to affect the policy of the emperors by shouting political demands between races. The imperial forces and guards in the city could not keep order without the cooperation of the circus factions which were in turn backed by the aristocratic families of the city; these included some families who believed they had a more rightful claim to the throne than Justinian.

In any case, the Nika riots had a lot more to do with Justinian's high taxes (evidenced by the protestors demands that John the Cappadocian, the chief tax collector, be dismissed) and with dynastic politics (seen by the elevation to the purple by the protestors of the senator Hypatius, the nephew of emperor Anastasius I), than with mere sports hooliganism.
 
Hitler appears in the Reichstag in 1932 wearing his brand new lederhosen. An SPD MP from Hamburg laughs mad at his, the event scalates and suddenly you have a civil war between Northern and Southern Germany.
 
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