Not really. Your assumption is that the circuits in the negative side of the uncompleted circuits would take on a negative charge. essentially fill with the excess free electrons from the battery's plates, waiting for some poor soul to create a connection to the relatively surplus-electron-free positive side of the circuit. It doesn't really work that way. An open circuit will have no current flow, a closed one will, the only change is in the direction of flow.
But in truth, if some poor soul completes a circuit with enough voltage to go through their body?s resistance the hard way it doesn't matter which side is the surplus electron side (negative) and which is the electron deficient side (positive). He/she is gonna get zapped.
Realize too that people generally get injured not from the zap, but from the aftereffects....like being startled and impaling one's head on the hood latch. Being electrocuted actually requires that the current be through a path that interferes with a person's heart rhythm or other critical autonomic nerve signal. Even lightening rarely kills, as it generally follows a path to ground that does not disable the person's critical systems. That?s why you?ll sometimes read of someone getting struck and their watch will be melted and their wrist burned, but they?re otherwise unharmed. The current will have passed (generally) over the surface of their body and out through their Rolex (all golfers wear Rolexes) to ground.
1) the circuits don't store the electrons. The battery plates do.
2) all golfers wear Rolexes.