It Never Fails

How come it never fails that when you are getting dressed up to go somewhere and you put on your nice shirt, you go to brush your teeth and you inevitably drop some toothpaste slob on your nice shirt. And you know, no matter how much water you put on that spot, it's not going away. But how come if you wash your shirt, it will come out? Or you shave, and you are pretty sure you didn't shave over any pimples or rough spots on your neck and you are pretty confident there is no blood anywhere... but when you show up at the event, you look in the mirror and there are ten tiny blood spots all over your collar and undershirt. It never fails.