We have an account in SFDC that we use to store 'hibernating' accounts that are unassigned. It's called "Bucket". When we first switched to Marketo, we sent an email to ~5000 people in 'the bucket' as part of a bigger email sent to everyone from their assigned lead owner. The emails all came from "Bucket" and were signed with "Best, Bucket".
Another time, our product team decided to send out an email but set up the wrong links. I didn't test the links because 4 people had already been sent the test email and all signed off, stating they'd tested the links. Once we figured out the links were incorrect, I decided to write a redirect on our server to reroute the link instead of sending a correction email. I made a minor spelling mistake in the redirect and ended up taking down our entire public site for a half hour until I figured out what happened. We sent a correction email afterall.
If you haven't taken down a site, sent a messed up email, or broken something then you probably haven't been doing this very long.