For me it is when i am so drunk. that in order to stop myself from falling, i have to run.....and it inevitably ends up in me hitting the pavement...however, the longer i stay upright, the faster i go....so in affect, im chasing the pavement, as its a case of me running tilter forward about 45 degree from the ground...
Hence the saying, should i give up drinking, or am i going to keep on chasing pavements, breaking noses, and chipping teefff...