How about this:
In consideration of being alive, I _______________ agree to never sue Nick Brennan for anything, ever.
Signed:
________________________
"In consideration of $1.00" would be how you word it, so now you have a contract. It's still legal if signed of free will (in that there is no law against it), it's still not necessarily binding. They are two wholly separate subjects. You see, if you knew you were being negligent and didn't care, you would then be grossly negligent and this contract wouldn't be enforceable since by law it is not possible to wave gross negligence.