There's a type of electrified plate armor for tanks (used by the Israelis) that can actually take an RGP hit. Most RPG warheads have copper cores -- what this armor does is literally send an insanely-powerful electrical charge through its armor that will disintegrate an RPG core on impact. Cool, huh?
Here's what I'd love to see in the next Batman film -- a group of criminals/gang leaders are escaping a bad crime/armed robbery scene, and as they're escaping they freak out when they see a new, somewhat revised Tumbler/Batmobile (covered in overlapping black plates, like a crocodile) bearing down on them. They open fire with conventional weapons, whereupon the leader pulls out an RPG and says, "I know how to handle this!" He fires the RPG at the Tumbler 2; the rocket hits and explodes in a fireball/puff of smoke...
The criminals cheer, "Yeah, we got the Batman!"
...and the Tumbler simply shrugs it off, continues to bear down, and emits a HERF (high energy radio frequency) pulse that shuts down their truck engine. Their truck veers across the road, slams into a lightpost, the baddies stumble out...
Whereupon Batman gets out and proceeds to beat the absolute *&#! out of every one of them. Police arrive with the guys trussed up and a note pinned on them saying, "I'll prefer charges."
Note that the armor and the HERF concept above are not only feasible, they exist today. A high-energy pulse can simply shut down a car ignition, and cops are investigating using these to end high-speed chases. (I'd also have the new Tumbler shielded from this so cops couldn't shut it down; its engine could be a turbine inside a copper wire framework, like a Faraday cage, that's protected from outside electromagnetic and radio interference.)
-- Admiral Nelson