These strange cases in Japan have been making the headlines there for a while now. I think it's been a while since the last case. Unlike the US, Tamiflu is used much more frequently in Japan. If these behavioral changes are due to Tamiflu, then we may not have noticed them here simply because it's not used that much here and/or health care providers may not make the connection and report it. Plus, I don't think it's prescribed for children much in America.