  Motivated by recent advances in non-Lorentzian physics, we revisit the
light-cone formulation of quantum field theories. We discuss some interesting
subalgebras within the light-cone Poincar\'e algebra, with a key emphasis on
the Carroll, Bargmann, and Galilean kinds. We show that theories on the light
front possess a Hamiltonian of the magnetic Carroll type, thereby proposing a
straightforward method for deriving magnetic Carroll Hamiltonian actions from
Lorentzian field theories.
