What is the worst bounty you have ever participated in? Why was it the worst for you?
It was Prymex because it's most likely a scam. They just want to milk investors and I am sorry for advertising such a messed up project. I just don't have much time back then to research on it that's why.
Here is its link though:
https://bitcointalk.org/index.php?topic=2204910.0;topicseen