http://www.omaha.com/article/20111201/NEWS01/712019925#town-on-hunt-for-elusive-ninja-cow (http://www.omaha.com/article/20111201/NEWS01/712019925#town-on-hunt-for-elusive-ninja-cow)
Plattsmouth is the town where I grew up, so it is possible that I think this story is more amusing than what it really is. Still, I like Ninja Cow.