Every year, Halloween sparks the sale of $3.9 BILLION on candy in the United States. But that's not the only impressive statistic related to trick-or-treating.

Several years after World War II, a couple in Philadelphia, Pennsylvania, had an idea — what if kids also asked for coins to donate to UNICEF, the U.N. agency that protects the rights of children worldwide. This year marks the 75th anniversary of that initiative, called Trick-or-Treat for UNICEF . And some $200 million has been collected during that time span.

This year's campaign features supermodel Heidi Klum , one of an esteemed group of past and present celebrity supporters like Jennifer Lopez, Zendaya, Sammy Davis Jr., Maya Angelou, Bob McGrath and even Lassie.

"We want to raise awareness for the importance o

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