Because mine won't! Why the hell won't it?? I have normal, dull brown streaked with grey hair that I've painstakingly grown because DH likes long hair, and before anyone jumps on me, I know I can cut it and it's my hair. The deal is that I have long hair and DH shaves every day and I don't put up with horrible scratchy stubble 
I have an amazing claw thing (see, this is why I've had short hair forever, I don't even know the right name for hair thingys) that holds it up in a pleat thing but if I plait it, it just falls out. What is wrong with my hair?