::I know it is common for users to leave a thank you note after a namechange.  One of them just thanked me on WP:CHU after I carried out his.  That's not what I meant.  That post was not ident. properly: theoretically, if he had forgotten to log in, or had been logged off forcibly while editing, we would have seen something like "thank you  ", but instead, there was just the "thank you" part, with no signature of any kind, which was not consistent with the registered user's behavior, since, as I said, he had used tildes every time.  It all pointed to a simple anon test.  As far as why at WP:CHU, or why say "thank you" of all things, well, it could have been in the spirit of the "can I really edit this" kind of test.Of course, none of this precludes peremptorily the possibility that it could have been indeed the user logged off.  If it was, than it was an honest mistake/distraction on his part, which entailed an honest mistake from me.  As that edit stood, there was no reason to assume that it was a legitimate contribution, although, as I said, nor was it really necessary to have removed it in the first place, since it was really doing no harm.