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To act like the Joker, you need to laugh like the Joker: exhale beforehand to sound huskier and laugh as long as you can. It helps to laugh hysterically at your own nonsense jokes, such as “I’m not mad at all! I’m just differently sane!” Don’t take anything too seriously, even when you’re planning evil plots and pranks with your minions. After all, behaving unpredictably helps keep people on their toes around you. For some prank ideas and more Joker mannerisms you can try, keep reading!