What are the most unethical things you could invest in?

I'm aware of ethical ETFs and managed funds which deliberately rule out investing in companies that are perceived to be unethical. I previously held some Betashares in ethical ETFs, but the more I researched the companies that made up the mix of the ETF the more cynical I became, and eventually I dumped it despite it being moderately profitable.

This gave me an interesting thought, however. What are the most unethical or straight up evil things you could potentially invest in? I'm thinking the following are probably on the list:

1) Defense industry 2) Coal 3) Oil 4) Banking, maybe 5) Cryptocurrency

Specific companies are worth listing too I think.