I apparently just parked the bike and walked away without locking it. I've had the bike since since July 2016 and I've never done such a thing. I go so far as to lock it up every time I ride the Max (Portland light rail.)
Protect your bike – get a security protection label!
Apply the protection label to your bicycle and instantly reduce the risk of theft by up to 50%! Moreover, if the bike is stolen, you increase the chance of its safe recovery by up to 70%.