A dad brought a lie detector home . The lie detector that read Siegfried Sassoon war poems everytime it detected a lie. The son comes home in the afternoon. Father asks him, ""So, you were at school today, right?"" Son: ""Yeah."" Detector: ""A dawn the ridge emerges massed and dun In the wild purple of the glow'ring sun, Smouldering through spouts of drifting smoke that shroud The menacing scarred slope; and, one by one, Tanks creep and topple forward to the wire. The barrage roars and lifts. Th…