So I've posted this on other forums a few months back and still have had no luck with a fix.
I have a Galaxy S3, on stock software. In the messaging app if I long hold and hit delete thread all it does is remove all the messages in the thread and send the empty message topic to the bottom of my app. I'm a bit OCD, and having like 100 empty threads at the bottom of my app is killing me, especially when most of them are wrong numbers or things of that nature.
Screen shot attached