I hit the refresh and there were already so many replies.
Type in lksjdfkljsldf, hit reply.
Screen refreshes, "Warning - while you were typing 13 new replies have been posted. You may wish to review your post.", I hit reply again.
Screen refreshes, "Warning - while you were typing 17 new replies have been posted. You may wish to review your post.", I hit reply 3 more times with a similar response.
Screen refreshes, "This thread is locked." notification pops up.
Crazy.