Muni issued an alert yesterday afternoon that said simply, "Emergency - Powell line cable cars back in service." Oh no! Emergency! Cable cars unleashed on an unsuspecting public! Save yourselves! Run for the hills! Oh no wait -- the hills are exactly where the cable cars WANT you to run! Okay, okay, we jest. Obviously it's just a poor choice of words, not real peril. We can't begin to guess why someone thought that......