There are those who laugh half an hour
because they cannot cry.
Laughter is as ancient as the bloody sun.
I would like to write a history of laughter.
In the Stone Age, the first men laughed with women,
women with women, men with men, some were
thrown out of their caves after all that grunting
and humping because they wanted romance.
There must have been laughter
before marriage vows and last rites.
"We are the only mammals that laugh" is not true,
every living thing sometimes laughs.
Flowers laugh so hard their petals fall.
Gardens are like theaters with comic
and tragic hydrangeas, some roses have thorns,
hollyhocks thrive on beer.
I hear laughing rain after a hot summer day,
laughing crows, doves, nightingales.
If you don't think maples, oaks, evergreens laugh,
come sit with me under a greenwood tree.
I laugh with raccoons who know me.
No one believes there are ghosts who laugh. 

--from 'Laughter'; Stanley Moss