The ruse can’t last forever, of course. Nearly 20 percent of the 175 million Americans celebrating Halloween will dress up their pets, an increase from last year’s 16 percent, according to a Prosper news release. I loved seeing Harley’s usual world full of horse piss gags (okay, I didn’t love the horse piss gag, but I’m talking about the world in general) run smack up against the reality of the Gotham she’s trying so hard to leave behind, but which is always going to stick to the bottom of her shoe in some fashion.