Tore mine senior year of high school. It was kind weird. I woke up one morning and my knee was sore and kind of hard to walk on, but then it felt better as the day went on. I couldn't remember doing anything to cause the soreness. The next day I played a game of backyard football and the knee got horribly worse. By the end of the game, I'd be running along and BAM! I'd fall over because my knee could no longer handle the running. It hurt pretty bad. This continued for a month or so and my knee would keep giving out while playing sports so I went to get it checked out. Doc ordered an MRI, said I tore my lateral meniscus pretty bad (3 on a scale of 1 to 3) and that I needed arthroscopic surgery. A few days later, I'm on the table watching the operate on my knee since I elected to stay awake for it. They had intended on removing the damaged tissue, but the damage was extensive enough that they decided to try to repair it instead to save me trouble later on. They put some stitches in it and here I am, about 8 years later with no problems.