This map comes from Joshua Katz, a PhD student in statistics at North Carolina State University, who’s 2013 project to visualize data from the Harvard Dialect Study went viral on the New York Times.

Detroit and Michigan are the only places in the US where the night before Halloween has infamously become known as “Devil’s Night.” Recent efforts under Mayor Dave Bing have reintroduced the night as “Angel’s Night,” but it may be too ingrained to rebrand. In all 11% percent of respondents called it Devil’s Night while 70% respondents across the country had no name for the night before Halloween.