A baker is outstationed at the customer's site so often that we hardly see him in the office. When he emails back, he'll often change his user name to confuse us. So far he has named himself Shinobi vs Dragon Ninja; What's my Age again?; Power Puff Fish... in fact he's changed his identity so many times that it's no longer possible to sort emails by sender name to track down emails from him.

At least I'm luckier than him, I'm not alone at a customer's site.