You may remember the episode of Friends in which Phoebe confesses that when she was young, she used to target "comics shop nerds" for mugging -- and that she had mugged a pretreen Ross.
Apparently this team of twins didn't mug anime fans on the streets of Akihibara -- they didn't have to. Instead, they exploited both the rigid etiquette rules of Japan and the fear of real-life females that these fans likely hold; and extorted money from the fans as an "apology" for bumping into the female twin.
Fortunately, the long arm of the law punished them for their rampant otaku exploitation.
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