re: Poker & $5 NLHE Full Ring: JJ shove over maniac's 4 bet?
Being in position is what makes playing post flop possible, if an over card flops then we can keep the pot small by checking back or just calling a standard C-bet, we can just fold if villain goes nuts, remember we aren't truly sure that they are insane yet, 60/40 is bad, but 9 hands is nothing.
It turns out that villain is pretty horrible and JJ is great here. If they won the all in don't get disheartened, these players are an absolute gold mine and you are two seats to their left, so you will have position on them in most hands. Just reload and pray they don't leave.