Why do wedding invitation RSVPs add the letter M on the line where you write your name? Are they really saving me so much time by supplying the first letter of "Mr."? That's what it's for, right? It seems so silly.

"Sorry I didn't reply to your RSVP, but I was running late and only had time to write 10 letters, so I just threw it in the trash and ran out the door. If only you started me off, perhaps with an M for Mr., I would have replied."

Since my name starts with M, I just like to write "ike Toole." It saves me a shitload of time. So really, I'm not complaining. Just curious.