Halloween can be a mischievous holiday. The most innocent of us reserve it for backyard parties and trick-or-treating, but some like to get a little rowdier than others. That’s exactly why various city councils across the U.S. have passed some seemingly unusual laws to regulate spooky festivities.

REHOBOTH BEACH, DELAWARE: NO SUNDAY TRICK-OR-TREATING

If Halloween falls on a Sunday, children in Rehoboth Beach are required to trick-or-treat the night before. The explanation in the city code is simple, but ambiguous: to prevent children and their guardians from going door to door on Sunday evenings. Rehoboth Beach law also forbids children from roaming the streets on Halloween “with the intent to cause trouble,” but what exactly that means is ambiguous as well.