On the 15th of August, the 'Jack-O Challenge' was born. The people of Twitter saw the opportunity to prove how flexible they are, or are not. Soon enough, everyone's timeline was full of images they'd rather not have seen. How about we keep this one strictly for the cartoons, okay? We don't want Jimmy Fallon doing this tomorrow night, right? Before that happens, enjoy these 15 memes about the 'Jack-O Challenge'.