I have seen proper strops and fists thrown just because a 'tank rush' was forced from quietly smouldering Australasia deep into the depths of Russia (Kamchatka) and into the US to stop the owners from claiming their due armies.
Risk: One of the best games for hidden truces, skulduggery, and finding a person’s true nature. Nothing beats a game of Risk with competetive ' friends' after closing time. Total domination is the best version.