For some reason, over the past two days, I've received no less than seven mis-delivered pieces of mail. For three different addresses, none of which are mine, or close enough to me that I could just go deliver them by hand. So, I wrote "Return to Sender" and stuck them back in the mailbox, hoping that the ones that were clearly bills got to where they were going on time.
Today, I come home from work. All the mail is gone, hurrah! Until I get to my door, and I discover every piece of mail, still labelled "Return to Sender", sitting on the ground in front of my door. My roommate definitely didn't bring it in, and I sincerely doubt my neighbours would have taken the mail out of our mailbox, especially being labelled as it was, and brought it upstairs.
Which means the postal worker got inside my building and put the mail in front of my door. Uh, what?