If you look to the right there are a number of posts that are listed from all over the forum area with the latest discussions. It's easy for someone to click on one of those and not realize what forum they've entered...
I, too, have made this mistake.
I entered a discussion once on something I saw posted on the right-hand side about someone not being allowed to enter a country because she was too obese. So I charged in there, posting, "I must say I'm glad someone, somewhere finally made this woman accountable to her own health issue."
I had no clue it was in the Large & Lovely room -- whoops. Moe called me out on it too.
It wasn't until later when I realized where I had posted...it would be like going to the Parenting room and while they're trying to discuss best practices in "Time Outs," for me to post something like, "Just SMACK the hell out of 'em!"
Since learning that lesson, I always take note of the room I'm in before posting, and I must say, I've declined to post some things after such realization.