There is already a strain called The Joker and it's a cross of GDP and Harlequin.
Hybrid - 50% Sativa /50% IndicaThis homage to Batman's least favorite psychopath is a blend of Vortex, a sativa from TGA Genetics, and the legendary OG Kush. The exact sativa/indica ratio of Joker's Grin is something of a mystery, though its mostly physical effects suggest the indica genes may be dominant. The THC and CBD levels in this strain are likewise hard to come by. The lack of information on CBD, however, suggests that CBD isn't plentiful enough to recommend this strain for treatment of seizures and other conditions that require the cannabinoid. But Joker's Grin delivers a calming physical buzz that can be very effective at treating bodily pain. It may also be useful as a treatment for anxiety and mood problems. The nugs are chunky and dense, with a visible layer of trichome crystals. The smell and taste are both distinctly sweet and fruity. The usual negative effects – dry mouth and red eyes – are likely, along with possible paranoia. Like TGA's Vortex, Joker's Grin is probably easiest to find in California, Michigan, Oregon, and Washington State, as well as Canada and Europe. But it's likely quite rare even in these places.