A mob of up to 100 youths brought a McDonald's to a standstill with a 'shameful' rampage which saw teenagers verbally abuse staff, jump over the counter and steal food.Youths chanted obscene songs at two female workers at the fast food restaurant in Wigan, Greater Manchester, as they tried to serve customers - and the video of their antics has gone viral after it was uploaded to YouTube.The yobs vaulted the counter into the kitchen area, threw litter and hurled abuse. Staff were so scared they pressed a panic alarm and police were forced to break up the disorder