Selling things online is a fickle business. It starts off fairly simple, you post an ad along with your contact info. You get a couple of replies, maybe get ghosted once or twice, perhaps a prank phone call or two. But the world of online business is a strange one, and it is bound to bring some pretty strange people to your doorstep if you are not careful. Here, in this case, OP posted an ad for a computer, stating the price of 900. Not one minute later, OP got a phone call. At first, everythin…