Friday the 13th is an episode in the Hey Arnold! TV Series.
It's Friday the 13th and everyone is worried and talking about superstitions. Well, everybody except for Arnold, who doesn't believe in silly superstitions. So when Wolfgang bets Arnold that he can't do a few superstitions without chickening out. Arnold is up for the challenge. Gerald however, is hesitant at first and is hoping that his lucky rabbit foot will help him out.
Wolfgang has Arnold and Gerald break a mirror, open umbrellas inside, cross paths with a black cat and much more. After they complete them all it's only a matter of time until their "bad luck" begins with Gerald stepping in some purple gum. But when Stinky says that Arnold and Gerald are both "cursed condemned and blighted" Arnold still doesn't believe in superstitions. After Stinky leaves Arnold and Gerald both open their lockers, only for all of their things to fall on them.
It's one bad happening after another as their desks fall apart, paint spills on them , their bikes have flat tires and they get fish heads dumped on them. The boys finally go to Madame Blanches for a bad luck removal kit, only for Wolfgang and Edmund to switch out their cream with honey barbecue sauce. Arnold and Gerald put on their garlic necklaces and the cream while saying the "bad luck removal chant", but just then a huge swarm of bees starts chasing after them. They run away and fall right into the fountain, washing off their cream.
The boys then notice purple gum on Gerald's necklace "Are you thinkin' what I'm thinkin?". They go to Wolfgang's house and confront him and tell him that they know that he was behind it all. Arnold tells Wolfgang that he really shouldn't treat people the way he treats them, pointing out that it's going to catch him sooner or later. They get 13 of Grandma's black cats and get them to come after Wolfgang. He get's freaked out, especially after Gerald dumps fish heads on him, and he runs inside.
Arnold and Gerald wish each other a "Happy Friday the 13th." They each pick up one of Grandma's black cats and go look up what "blighted" means."
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