Sarin, "Do not feed the Troll" :)
I'm sure this topic is clear enough for every person to know what is it about. Harshel's behavior is nothing more than trolling. Just ignore him, because every time you'll reply he'll have an anchor to reply more.
Having a signature is like keeping a gremlin.
Just don't overfeed it, don't make it wishy-washy and you'll be a good responsible Signature Keeper :]