This piece of string walked into this bar and asked the bartender for a beer. The bartender replied; sorry we don't serve strings here. The string went outside, he saw this man walking by. He asked if he would tie him in a knot and loosen his ends, he said sure.The string walked back inside and asked the bartender for a beer. The bartender poured him one, as he sit it down he asked; aren't you that piece of string who came in a few minutes ago? The string replied;  no I'm afrayed knot.