It happens because it happens. 
Be it gloom or bloom, 
happened is happened.
Things down or up, 
Pure or sure, 
Dearing or daring,
Intended or pretended,
A leaf's fall or all that unpleasant,
Happened so is happened.
Cry or fry on a nonstick pan
Happened will happen.
Merrily so or heavily so
All that happened is just happened.