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
What is written on Harley Quinn's bat? - Quora
Harley Quinn's Bat | Yogensia
What is written on Harley Quinn's bat? - Quora
WOODEN Harley Quinn Bat Suicide Squad Replica - Etsy
Suicide Squad- Harley Quinn's Correct Bat Script by BrianaNorman22 on DeviantArt