["I didn't notice it until I got home from work, but I had a huge ketchup stain on my blouse!", 'oh, thats embarassing.  I hate it when that happens.', 'Yes, and none of my co-workers told me! I would hope someone would let me know!']
haha, well maybe they didn't want to embarass you.
I had a ketchup stain on my blouse at work, and no one told me about it! I didn't find out until I went home.