most embarrassing moment, well one of them

I was fifteen at the time and had just started my period. I was also working after school at the local supermarket and loved it there.  Having no particular knowledge about sanitary towels, I used one with no sticky back.  Well as the story goes, I was filling  the shelves, when suddenly one of my co workers said 'whats that?'. a sanitary towel was lying on the shop floor, I picked it up hastily exclaiming 'how disgusting!' and shoved it in the bin. I think she knew, I knew and realised that my days were limited there. There have been other embarassing moments in  my life and will reveal more in time, but first I'd like to hear of other peoples embarassing moments, please comment.x