The man was with several other people at the Dunkin' Donuts, 5201 W. Fullerton, when a group of people started hitting the window, trying to get the man and those he was with to go outside, police said, citing preliminary information. Instead, they tried to go to the washroom, but employees at the doughnut shop told them they could not, and soon after, those who had been outside went into the shop and a fight started.