Check-In – Day 21

[samuraiter]

"Well, it's useless to be popular with the enemy."
— Bowman Jean, Star Ocean: The Second Story

What have you been doing today?

— Thinking. Maybe a little, maybe a lot.
— Writing.
— Planning and / or researching.
— Editing.
— Sending things to the beta.
— Posting!
— Relaxing, taking a break, etc.
— Other stuff-ing. Look at the comment.

Question: What is the worst grammar goof that ever got past you (and your betas)?