Oops - did everyone see that?

Why does every mass email I send out always end up having one mistake in it? ALWAYS. How does that happen? What kind of Murphy's law of averages applies there? Because most regular emails I send out have no mistakes in them. So why is it that all my (really dumb) mistakes are concentrated in the few emails I send to ABSOLUTELY EVERYONE I work with?????

And I know my coworkers talk about it. I mean, I talk about it when it happens to someone else, so I know how these people operate.