2353, when Worf was thirteen, he was captain of his school soccer team at Gault colony. The team made it to the championships that year. Near the end of the second half, with the score tied, Worf's team got a corner kick. Worf and one of his opponents, Mikel, both leaped up to head a highflying ball. Worf successfully made the goal, however, their heads collided in the process. Mikel's neck was broken and he died the following day. This incident scared Worf for the rest of his life, showing him that in order to live amongst humans he would always have to restrain his emotions and Klingon personality. (DS9: "Let He Who Is Without Sin...")