There was this HIT which wanted an adult story, I really lived out my fantasy on that one. The requester was so happy with the story that he even chipped in a $1 bouns
The one where I decided to give a flying snickerdoodle about Michael Jackson dying. I did feel a bit guilty afterwards, so probably won't do that again.
There was one I did that was a survey and negotiation task... basically it gave you a background story, you were either a manager hiring for a position in a company that had to negotiate a salary and bonus for a new employee, or you were the employee trying to negotiate the best deal for yourself. I was given the task of being the manager. They gave me a maximum salary and bonus, and my job was to try to negotiate with the employee to keep the salary and bonus as far below the maximum as possible. At the end I was connected to another Turker in chat to actually carry out the negotiation with them, and based on how well you did you got a bonus on Turk. I did pretty well and ended up getting a $7 bonus, on top of the $4 that the HIT paid. So in all I made $11 on that one HIT that took about 20 minutes.
Something on those lines, but a different HIT. I was asked to predict the value of shares of a particular company. The HIT was worth $10 and took me 10 min. On top of that, I was awarded $5 bonus. I was invited to play the game again after a month. But this time the HIT was worth $1. Managed a bonus of $7
Yeah I've had a few others like that, $11 (reward + bonus) was the best so far. I had a few others that were $2 and got anywhere from $4-$5 for a bonus. A couple have been decision making tasks, where you are either the decider or receiver in a task where one person decides how to split a certain amount of money between themselves and another person.