What do you post when you have nothing in mind?

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Hmmm...Now this is what i wanted to ask for a long time. Sometimes you want to post something but there is nothing in mind. Totally blank. So what do you do in that case? You wait to come up with some topic or you just post anything for money? This topic can also be seen that way. I was thinking of starting a new discussion but had nothing in mind. So thought of asking you all what you do?