A "superfluid" of pseudo-bosons in the form of Cooper pairs of electrons can manifest superconductivity...

"There are other bosonic 'fluids' which also display a behavior analogous to superfluidity. This is the case of the conduction of electrons in certain metals which, interacting via the vibrations of the crystalline lattice, form pairs of bound states - the 'Cooper pairs'. These electron pairs may be considered as being bosons and their 'superfluidity' - analogous to that of helium atoms - gives to the metal the property of 'superconductivity': below a certain critical termperature its resistance vanishes completely, just as does the viscosity of a superfluid..."