Inquiring minds want to know, so I plodded out to my Sentra and inspected the headrest. The twin prongs are nicely chamfered at a 45 degree angle (impeccable Japanese crafsmanship)- wouldn't want the owner to get any nasty gashes or cuts which could result in expensive lawsuits....

"If it saves only a few people that´ll be enough" has a nice ring to it, but some sort of rescue tool will probably be far more effective. Rather than wrestling with my headrest, I am more likely to use the Phillips head screwdriver on my Leatherman tool. It will likely be far more accessible.