How to you think of a subject for a new discussion?

I am in a situation where I ran out of topics. I created more than 500 discussions till now. Also, we are not supposed to create the same discussion here. If we do that Mylot admin will delete that. So, the only option is to think creative and come up with new topics. I think one good way is to observe people around. Target one person one day. I do that sometimes. Once I targeted my colleague who sits next to my desk in the office. I closely observed him the whole day. I keenly analyzed the way he talkes, the issues he talks, and the concerns he has in life. Then, I found out that he is a miser. Then, I thought about the miser friends I had and ended up creating a discussion about misers. I got many responses for that discussion.