The names in the story have been changed to protect not the innocent but the very very stupid. So I set up test accounts for each team member in the new test environment for our project building the new web interface for our SaaS product. Each username had an underscore in it like john_smith. I told everyone the news in the morning scrum and got 2 requests for help an hour later from people saying they could not log in with their username johnunderscoresmith.