I thought this was funny...
For the rest of the information about Hobos Go To:
http://www.hobo.com/what_is_a_hobo.htm

What a hobo looks like:
To begin with, there is no real way to visually tell who a hobo is, there are no specific uniforms, or style of dress. No secret hand signs, or greetings, no membership cards, and contrary to most police attitudes, no organized gangs. This Idea come from an attitude called "Pass The Buck", where a police officer cannot figure out a conclusion to a crime, so the police officer finds a Hobo to blame. And where a Hobo is concerned, migratory in activities, and habits, they are still predictable to return to places and areas they deem comfortable with a frequency. With only a past history of employment, they return to areas they are used to, the police know this and so, with that predictability, they haunt areas that Hobos frequent. Looking for someone who fits the description of the criminal suspect the police cannot otherwise find. The Hobo, having no community ties in the town, has no physical proof of his travels, and past places of residence, and therefore is an easy scapegoat to blame for what local crime the police cannot otherwise solve. The traveling and working man/woman know each other by sight and nickname from past experience of travel, work, and residence of locales. Life habits become character traits, which are the fingerprints of each Hobo encountered. There are many eccentricities of each Hobo that cause each one to be identified in the Hobos dress, name, way of living, and what friends he/she surrounds themselves with, or if they are loners.