when I get a package with the book I completely forgot I pre-ordered
Alternately: when a publishing friend puts you on the ARC list for a book without telling you!
"Man, these posts are all so insightful and well-reasoned. It’s a good thing the trolls haven’t started commenting ye— oh. Oh, no! Again!"
"Just here to read some of the comments on this Jezebel article— oh. Oh, no."