Project Arts Centre, DublinCracking male banter gives way to seeping sadness in John O'Donovan's play about three men grieving for their friend Tripping on drugs, 17-year-old Liam lies down on an empty road and sees his future flash before him. In John O'Donovan's intricately structured new play for One Duck Theatre, the mystery of Liam's final hours on a summer's night in County Clare brings his three best friends t…