I searched for something similar to this thread and didn't find one. If I missed it, I apologize.
The idea is to say something nice about the last poster. Yes, that means this threat is the alter-ego of the "Reveal the previous poster's deepest, darkest secret" thread.
Have fun!
The idea isn't that you actually know the person who posted, but to just be funny have have a good time. So make something up if you don't know the person.
Since there is no one before me, I will add a general compliment to the next person who posts:
the next person who posts is really good at juggling. He or she can cook, clean, answer phone calls AND tend to their kid's incessant screaming all at once! I commend you!
(see how the idea is to be funny...)