April Fools' Day is a national menace. Sure, if everyone in America were as funny as they think they are, it would be a big laugh. But they're not. Oh, they are so surely not! And so Last Week Tonight host John Oliver asks that you take a solemn vow: "I will not play any practical jokes and if I see someone planning a prank I will say to them, 'Hey, you're being a dick right now. Stop being a dick.'"

Only YOU can prevent April Fools' Day Facebook fake-outs.