In all seriousness... how do they expect to generate energy with this? I mean 99% of a subway ride is either you sitting there, or standing room only. Either way, you're not walking around and thus not generating any power unless you are boarding or exiting. I didn't RTFA, are they talking about putting these peizoelectric generators on the floor of the station or the subway car itself? It would probably make more sense to line the damn subway tracks with something like this so that they can "recycle" some of the energy used to power the cars.