I have strongly considered this option before. But like @ivetried089 said, I think my parents would be able to figure out what I was doing. I think it's far better to just try to make some good memories with them before you pass. After the fact, they will also know what you were trying to do, and while they will hurt so badly, they will eventually appreciate what you were trying to do.
And also, how much of an asshole are you willing to be, to your parents? You would have to behave pretty badly for them to be "relieved" by your passing, I bet. Like heroin benders, getting into serious trouble with the law shit like that, for months or years.