The data heads at Zillow have taken a break from churning out serious research briefs and Real Estate Market Reports to rank the 20 best cities to trick or treat this Halloween.

FORBES: 2011 Trick-or-Treating Hot Spots

But if I then mention the little orange Trick-or-Treat boxes on Halloween, suddenly everyone knows UNICEF.

CNN: How UNICEF became a Halloween treat

We grew up carrying those Trick-or-Treat for UNICEF boxes on Halloween night, and now our kids do.

CNN: How UNICEF became a Halloween treat