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USA and China are standing opposed to each other. USA says "Fuck off commie". China says "Fuck off yankee". Pol Pot enters the scene, both look at him. Pol Pot says: "Yo, help me with this genocide thingy please". USA and China put their hands on Pol Pots shoulder and say "Of course Pol Pot".
Explanation:
Pol Pot was the dictator of Cambodia. Under his rule he an his party, the Khmer Rouge, commited the Cambodian genocide. Both China and the USA supported the Khmer Rogue, though China did it more openly. The Soviet Union opposed the Khmer Rogue goverment as it was an attempt of China to stop the spread of Soviet influence in South Asia.
They agreed on TWO things. The US and China both supported Pol Pot because they both hated Vietnam, and Pol Pot was going after Vietnamese people in Cambodia, and at least played with the idea of taking Vietnam on in a war.