Advice from the University of Wisconsin Police, which I just received by email.
Never walk alone, particularly at night. So... even in daytime, we're not supposed to walk alone? Even if I whistle "You'll Never Walk Alone" and make believe I'm brave?
According to UW Police, there's a "violent predator" at large. Twice, recently, a woman was walking alone on campus and a man came up behind her and hit her on the head. That's bad, admittedly. But never walk alone?