New Halloween Trend: Prisoner in Cage Costumes

This Convict in Cage costume depicts some sort of undead zombie ghoul prisoner. Perhaps he starved to death inside his cell, then re-animated, like some prisoners on the current season of The Walking Dead.

This variation on the costume is a caged skeleton.

My least favorite cage costume is this caged gorilla. It doesn't make sense to me - why would he be in a prison cell cage instead of a zoo cage?