An actor's repertoire of skills is incomplete without the ability to cry on cue. An actor needs to be a master at drawing from the emotional well of his mind, and harnessing genuine feelings to create believable characters.
Many actors and actresses make themselves cry by thinking of sad or unhappy events that happened to them. Others can do it on cue with no provocation.
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Acting Tips - How To Cry. Another tip I would suggest is practice crying often.