In a medieval fantasy version of Batman, the Joker transforms himself into a hideous dragon, laughing gas leaking from his toxic maw. But even in his new form, the Joker still remembers to grin. See the full image below.
Artist Sandara created this Batman-vs.-Joker showdown. She has a number of other magnificent dragon paintings, some of which are available as prints from Society 6. Hopefully she'll make this available for sale as well.