@therealsupes on Twitter has managed to grab the first available video of Lady Gaga (Harley Quinn) singing and dancing her way down the stairs made famous in the first Joker film from the upcoming Joker: folie à Deux. You can’t quite make out the song, but she’s belting out a big showstopping number from the sounds of it. We wouldn’t be surprised if the first trailer for the film hits this summer… maybe during Comic Con.