Like it says, accuse the person below - perhaps after responding to the accusation of the person above.
E.g.:
1st poster says, "I accuse you of being Adolf Hitler!"
2nd poster responds and says: "Well, that's Godwin's law for you. I accuse you of being a hamster!"
Etcetera.
I accuse the next person of being a human!
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"In the kingdom of hope, there is no winter."