What most naturally follows?

How to fake cry
Close your eyes and imagine a sad event.
This method is used by many actors who are able identify so strongly with the sad situation they are portraying that they cry with tears that seem to flow from true emotions. You can emulate this technique by simply thinking of something very sad, so sad that it makes tears spring to your eyes.
It's different for every person, but here are a few examples : The death of someone quite close to you. A really bad breakup something you aren't able to talk about with people being bullied a sad moment you have been through.