In Suicide Squad (2016), the writing on Harley Quinn's baseball bat is a quote from her first appearance in Batman: The Animated series, specifically the Episode “Joker's Favor”. : r/MovieDetails
Clay Enos Shares Up Close Look At Harley Quinn's Bat In Suicide Squad
Amazon.com: POSTER STOP ONLINE Suicide Squad - Movie Poster/Print (Harley Quinn - Posing with Baseball Bat) (Size 24 x 36) : Office Products