Background: In Russia there is an action called Knocking on wood to prevent anything bad from happening. They preform a knocking action and then make a spitting noise over their left shoulder since many myths believe that is where the devil is.
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Since the knocking on wood action is not very common among other countries Russia prefers to keep the habit at home. However every now and again he will accidentally let it slip during meetings. The other countries usually try to ignore it for fear Russia may attack them while others (America), prefers to make a huge announcement on how strange the action is and his wonder on why he does it. Once Russia had enough of America's comments and decided to spit on America since he was considered "самый демонический дьявол" by Russia and earned a laugh out of the other countries.
-Salinas