People love to laugh at other people
Whenever someone does something
Really stupid or embarrassing
They love to point it out and laugh
The main impulse to laughter being
Expression of their happiness in witnessing
Someone else doing something stupid
That they themselves have done in the past
Or something similarly stupid
But no one knows about
At least not anyone they know
And will keep it that way
So at seeing someone doing something
Really stupid and embarrassing
Most people react by laughter
A direct expression of their happiness
In essence being able to finally
Let go of their embarrassing
Stupid past moments
And move on