Mine was when I was 13 and I was in a play. On the opening night an hour before the play started one of the adults in charge said " um you bled through you're costume.'' I didn't know my period started so I didn't notice  and everyone was staring at me!! And laughed. and for some reason I lied and said "but my period ended last week" and she looked at me like "sureeeeeeee" and she took the skirt and washed it. literally 2 minutes before the show started I got my skirt back.