crying 
"There was a study done where a control group of 100 people were divided
into two.
50 people watched a very funny, tears-of laughter type movie.
50 watched a very sad and tears of compassion type movie.
At the end of the sessions researchers collected the "happy tears" and
the "sad tears" with eye droppers.
They found that "happy tears" are made up of brine...salt water and not a
great deal else.
However the "sad tears" were found to contain the very same chemicals
and enzymes that are found in tumours, ulcers and other such lumps and
bumps and sicknesses through out the body.
This test concluded that the body, when crying in sadness etc is literally
flushing out all of the toxic-chemicals that accumulate and are a part
of the sadness /heart ache experience.
Therefore if one holds back those tears, those toxic-waters will find
somewhere else to deposit themselves..... and prolonged
lack-of-crying-release will guarantee that the body will accumulate a huge
amount of internal pollution and toxicity that should have been released
through the tears........is it any wonder that the eyes sting so much when
we hold back our tears?"
Start crying...hehehe 
mods pls. move if this is not the right section to post this one. ty.