I'll give them over to science, where they're anxious to have them to prove kebsfroggies are the best!

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Biomedical researchers have identified four biological mechanisms that function as catalysts influencing the amount of tears we will shed at a given time: genetic influences,dietary factors, hormone levels and circadian rhythms (we are more likely to cry if we are sleep deprived and at certain times of day). Once the tear switch is flipped a complex interplay of psychological and neurobiological processes allow tears to flow. We really know very little about the precise psychological and biological processes that initiate an episode of crying or when it will stop. However, recent biological studies offer strong clues to how and why crying is related to health benefits.

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From: http://www.helium.com/tm/339767/scie...ports-accuracy