  We revisit AdS$_2$ holography with the Sachdev-Ye-Kitaev models in mind. Our
main result is to rewrite a generic theory of gravity near an AdS$_2$ throat as
a novel hydrodynamics coupled to the correlation functions of a conformal
quantum mechanics. This gives a prescription for the computation of $n$-point
functions in the dual quantum mechanics. We thereby find that the dual is
maximally chaotic.
