<human>: He's an ex-fling of mine and it was over more than a year and a half ago.  He's put me through a lot of bullshit over the last little while: spreading rumours, harassment at bars, parties, and more, and honestly I'm just really getting sick of it. He's really not an intelligent person so it wouldn't be very difficult to trick him into doing something. Example of his stupidity, and the most recent thing he's done: he went onto his friend's Facebook account and was sending me creepy, perverted messages with really personal information in them, all while assuming I wouldn't find out it was him. He's our only mutual friend and he's spoken to me about this friend before.

Anyway, this guy has had a girlfriend for the entire year and a half and is still doing this. He's also aware that I have enough blackmail on him to ruin their relationship in a split second - but honestly, I'm not a shitty enough person to ever do that. 

He's a part of that Primerica thing and has dreams of making millions of dollars with it. I know one idea that he was working on, and I was planning on having a friend pose as a rep for Primerica and make him believe that he was going really succeed, put him through a really humiliating interview, make him feel like a moron, record it all, all that good stuff. Harmless but funny, all while not showing my face, just as he always attempts to do.

I know that I would be sinking down to his level, but I'm sick of being angry and just want subtle but hilarious revenge. Maybe make him cry a little.

Any ideas?

Provide a brief overview of the text.
<bot>: An ex has been harassing me, while I have the power to really fuck up his life, I am only seeking harmless, humiliating, and hilarious revenge. Help me out!