In case you’re one of the few Americans who hasn’t seen “It’s the Great Pumpkin, Charlie Brown,” a well-known gag in the long-running television special involves Charlie getting rocks for Halloween instead of candy.

“Every once and a while my sister and I thought it’d be fun to give somebody a rock,” Jill Schulz, the youngest daughter of Peanuts creator Charles M. Schulz, told TheWrap of her own childhood memories from Halloween.

“I’m pretty sure they knew we were joking,” she added of her real-life Halloween rock prank.

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Dressed in his awkward, homemade ghost costume during a neighborhood trick-or-treat escapade with friends, Charlie Brown famously exclaims “I got a rock!” every time he peers into his Halloween candy sack.

Unlike Peppermint Patty, Sally and Pig-Pen, who get gobs of sugary treats,...