The most interesting and funny answer will get MHO.
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Russian's won't be able to make Vodka. Farmers will go out of business, so will a lot of people in hospitality. Mass unemployment will strike the globe. Fight's will break out in shops to preserve the remaining potato products. Riots, mass shootings, all commonplace in the streets over remaining packets of potato chips. The economy will crash. Crazed potato lovers running rampant. But that isn't what you should fear most, oh no not at all. The true horror will be MEEEE. I will lay waste to anyone who comes between me and my potatoes. Hundreds of years from the incident your grandchildren's grandchildren will be told bedtime stories about the ancient potato lover who killed thousands to lay claim to the remaining potatoes. "Don't be naughty," they'll say "or the potato lover will come. You don't want to anger... Checkers82."1