Potato Greens Prophesy

I had this conversation with one of my Liberian colleagues this afternoon:

Him: Are you eating your potato greens?
Me: No, why?
Him: There's a rumor going around Liberia that you have to eat potato greens for three days, or else you will die or something bad might happen to you.
Me: Huh?
Him: It's a prophesy. I don't know.
Me: Are you eating potato greens?
Him: Yeah! I don't want to die!