Don't talk to strangers walking a ferret

We saw this man walking a ferret on a leash in Covent Garden.  Pam went to catch up to him to talk to him about his ferret, but I stopped her.  I'm thinking this guy looked unsaven and a bit looney and that it probably was not a good idea to make conversation with him.  People were staring at this guy with his ferret, note the couple on the right.