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Given a cartoon image and a caption. Caption: The revolution has begun! Question: Generating an explanation of why this image/caption combination is funny. Answer: 
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The communist revolution is an overthrow of the capitalist class by the working class, as theorized by Marx. Here, the window washer and the businessman have swapped jobs, i.e., the businessman was overthrown from his post. The man in the desk on the phone is purportedly informing his comrades that this is the first step of the revolution, and they can all begin to do the same. The revolution usually is portrayed as more violent, so it would be surprising if this really was the first step.