#1999: Selection Effect
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Transcript
[Ponytail stands on a podium giving a presentation in front of a chart with some box plots.]
Ponytail: Our research shows that compared to the overall population, people who agree to participate in scientific studies are significantly less likely to call the police to rescue them from our lab.
(Sourced from explainxkcd.com)
Title text:fMRI testing showed that subjects who don't agree to participate are much more likely to escape from the machine mid-scan.