Interesting advice.<p>I don&#x27;t really work in a dangerous part of town. But there&#x27;s a group of shiftless young men who constantly pop up here and there. I refer to them as the Meth Head Bicycle Club (MHBC) as they tend to bike around and assemble in small groups at the local McDonald&#x27;s or Rite-Aid (where AFAICT they take turns shoplifting petty items).<p>The other day I was walking to a nearby restaurant in the area that takes me along a somewhat marginal low-traffic area that borders an older industrial zone. As I&#x27;m walking down the road I see a member of what looks like the MHBC biking towards me. As he got closer, I noticed he was audibly muttering random swear words. I didn&#x27;t feel threatened by it but was obviously on my guard. He biked past without incident and I just concluded he was crazy. But something didn&#x27;t seem right about that conclusion. Why the bike (which was one of those urban lowrider types and seemed to be in pretty good shape)?<p>Your first bullet point now makes me wonder if this wasn&#x27;t actually a quite uncrazy deliberate behavior. That would make more sense.