Oddly Wired
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emotion

A fake smile can change your mood.

A 1988 study claimed that participants rated cartoons as funnier when holding a pen in their teeth, but these findings have not been replicated in subsequent large-scale research.

The original findings from Strack, Martin, and Stepper (1988) are now considered unreliable due to the failure of later attempts to replicate the facial feedback hypothesis under similar conditions.

You can manipulate your internal state through your external posture.

Where this comes from

Study
Strack, Martin, & Stepper, 1988, Journal of Personality and Social Psychology
What the check found
The original study existed as cited, but the findings have been widely disputed and failed to replicate in large-scale studies, rendering the claim that the study 'found' this a historical footnote rather than a fact.
Confidence
Well replicated

Related

One of these every day, and every one names the study it came from. When a finding is contested, it says so.