A new study out of UCLA found that most of the time when you fake a laugh, people KNOW you're faking.
In the study, people recognized fake laughs 63% of the time . . . and were only fooled 37% of the time. Which means if you fake three laughs, people are going to know you were faking two of them.
The researchers say fake laughs DO sound different, because they're controlled by different parts of the brain.
Real laughs are controlled by your emotional vocal system, which opens and closes your windpipe quicker to control your breathing while you laugh. Fake laughs are controlled by your speech system, so the breathing is different.
(UCLA / Jezebel)