When you take public transit, you are agreeing to the possibility of seeing some very strange people. It's almost like an unofficial social contract you sign the minute you step on the train, bus, ferry, etc. And when you do find yourself in these shocking, confusing, and cringeworthy moments, you may stop to ask yourself if there's some sort of special event going on that you don't know about. Perhaps you forgot that it's Halloween or perhaps there's some sort of popular musician's concert in…