Three Humped Camel

Listen up, buttercup. This joke is funny because it takes a common animal (a camel) and twists its description to something totally unexpected and dirty (a prostitute). The humor comes from the surprise and the ridiculous image of a camel being a "prostitute from New York." It's all about that funny contrast that you didn't see coming. People from New York are sometimes stereotyped, which adds another layer to this joke.