Thanks. With that info, I'm sure I'll be able to find it.It's a reference to a production photo of the original Laser Optimus Prime's trailer base that had all of the base's features labeled with humorlessly simplistic descriptors like "Big ol' tower!" and "Some sort of bucket".
It had previously been posted on the old forums years ago, but has since been lost in the big forum crash hack of last year. It was originally posted by The Spacebridge, so the original photo could still be out on the Internet somewhere.
EDIT: It didn't even take me long.