So I have seen this commercial a few times and mostly I laugh.  I never apologized for having a period - I apologized for the crazy, overreactive, crying, angry person it could make me...  I guess Midol is trying to get its market back.  Toy

I agree, never apologize for what happens naturally.
However, don't be a fuckin raging lunatic bitch, and you won't have to apologize for your emotional instability. Period!