https://www.reddit.com/r/serbia/comments/1jchks6/novi_snimci...
Please take into account that this occurred during the fifteen-minute silence observed by the protesters in memory of the fifteen victims of the accident, which the protesters blame on the government corruption and which was the very reason for the start of the protests.
The assassination of the archduke was like flipping a light switch in a house saturated with gas. Austria declares war to Serbia, which is defended by Russia, so Germany has to declare war to Russia; Germany expects France to join Russia so they declare war to France, but their battle plans to conquer France require passing through Belgium. The UK needs Belgium to remain neutral, so they declare war to Germany... and so on. Once the wheels are in motion, and everyone is ready for war, war just happens - whether coke is there or not.