The "Walk the Line" star, who portrays the supervillain in director Todd Phillips' recent take on the DC Comics character, didn't have to endure hours in hair and makeup - as is typical in such roles - because he just didn't have the patience.
Joker makeup artist Nicki Ledermann tells Dazed Beauty, "It took an average of 15 to 20 minutes to apply the makeup, partly because it was hard for Joaquin to sit still but also because I didn't want it to look too precisely thought out."
To achieve the ideal image, Ledermann opted to apply the cosmetics freehand - but that posed a few problems as filming progressed.
"The hardest part of all was nailing continuity - when you film a movie, you don't shoot in scene order," she explains.
"One day you film a scene that is being continued days or weeks later and you have to match it exactly frame to frame. Because everything was freehand, it took a lot of record-keeping and solid painting skills to match and progress it."