Our period's synchronisation, can have but one explanation.
WE SPEND TO MUCH TIME TOGETHER!
Although you won't see me complaining because I love my friends!
However, when you and all your friends all have Aunt Flow visiting, everything is a giant ball of PMS! But, this can also be freaking hilarious.
A good thing about having your period at the same time as your friends: You never have I worry about running out of pads or tampons or whatever you use!