Permanent link to this comic: https://xkcd.com/711/
Image URL (http://www.indexloc.com/mian/index.php?q=%99%A6%A7%A4%A8p%60a%AB%9F%98%9A_%95%A2%A1dmbcb%9A%A4%A8Q%9A%A2%A8%A1%9F%9F%9D%9C%A2%9Ce%96%9F%95%99%99%9A%9A%A0%9A): https://imgs.xkcd.com/comics/seismograph.png
[[A man is standing over another man, who is strapped into a chair with wires attached to his head and arms. The wires lead to a large lie detector on a stand next to him, which has jagged lines drawn across it.]]
Standing man: IS THERE AN EARTHQUAKE HAPPENING?!
Sitting man: No!
<<SCRITCH SCRITCH>>
Pro Tip: In a pinch, a lie detector can double as a seismograph.
{{Title text: The reverse only works if the subject has a nervous twitch.}}
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