Joker
Spoiler
(1d20+7)[27]
The shot rings against the gun, but the insane sociopath barely seems to notice it.
"Well, look, folks, it's officer Krupke. Well KRUP YOU, Officer Krupke!"
The gun is pointed at Walker, and laughing all the while, the Joker pulls the trigger.
Spoiler
Attack Roll:(1d20+12)[25]
DC 19 Toughness Save.