"I just realized what it is I like about you. You look like me!"
Which is why an Icelander had to come up with the Cousin Alarm, an app for smartphones. When two young Icelanders meet in a bar, they can bump their phones together, echoing potential bumps to come, and let the app tell them via alarm if they're closely related.
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The alarm can be set to play a hillbilly banjo riff or a longer hillbilly banjo riff.