Last night read the first volume of a mahjong manga where a Vegas magician and John Oates engage in a cheating mahjong battle against an antagonist running a gimmick so insane I'd heard "so there's this mahjong manga where"... about it, years ago.
rot13 spoiler for the shocking part, which this volume only just barely approaches: N tnatfgre pubcf bss uvf bja svatref, chgf zntargf va gurz, naq ernggnpurf gurz ntnva fb ur pna purng ba nhgbzngvp znuwbat gnoyrf
content warning for the actual comic: grotesque violence, sexual assault. very grimy underworld stuff