This happened in Jalan Buluh Kasap, Segamat, Malaysia, on a road heading towards Seremban. According to the authorities, the bikers entered the road rage mode when the fuel truck sounded his horn. To show their dissatisfaction, the bikers tailgated the truck until eventually the passenger dismounted in an attempt to climb up the cabin of the moving truck. He slipped and fell under the truck, who ran over his lower body.
The guy got his leg amputated and is in hospital. Props to Best Gore member @bloodstorm09 for the video: