You hair stands up because the excess negative charges that you are accumulating are repelling each other.
(You hair; stands up; because the excess negative charges that you are accumulating are repelling each other) (the excess negative charges; are accumulating; you) (the excess negative charges that you are accumulating; are repelling; each other)
You hair the excess negative charges the excess negative charges that you are accumulating
stands up are accumulating are repelling
because the excess negative charges that you are accumulating are repelling each other
you
each other