  The aim of this note is to present the recent results in [16] where we
provide the existence of solutions of some nonlinear resonant PDEs on the
2-dimensional torus exchanging energy among Fourier modes in a
\emph{chaotic-like} way. We say that a transition of energy is
\emph{chaotic-like} if either the choice of activated modes or the time spent
in each transfer can be chosen randomly. We consider the nonlinear cubic Wave,
the Hartree and the nonlinear cubic Beam equations. The key point of the
construction of the special solutions is the existence of heteroclinic
connections between invariant objects and the construction of symbolic dynamics
(a Smale horseshoe) for the Birkhoff Normal Form of those equations.
