I would start demanding obscure things be added to the deal just to see how far they will go. I used to reply to all Nigerian princesses and deposed government officials in exile. I was supposed to go to Thailand once to help one invest in an Alpaca ranch. I had the guy, whose first name was "Engineer", agreeing to meet me at the airport in Bangkok with a limo, four Thai girls, and a dog of suitable size to feed all of us. I explained that dog was my favorite dish, but was illegal in the US. I also told him not to worry, that I would do the cooking and like any good south Louisiana coon ass, I always bring my own hot sauce.
I was going to meet another in Africa and on my way pick up my friend ( Odd Job from Goldfinger) who raised fighting cocks ( that made for some great double entendre discussion) and was the finest baloot chef on the planet. Every email exchange, they asked for bank info, and I just replied with more stupid questions about anything but the money. I attached ridiculous photos to every email I sent. Odd Job and his hat, Alpacas, baloot, me ( actually a pic of Robert Conrad), etc. I gave them the fax number at work and I received bank forms almost daily for at least a week. I wish they still sent those scam emails. Now I mostly just work when at work.