Would breathing dark matter give you a squeaky voice?
The abundance of matter in the universe is about 90% hydrogen and 10% helium with tiny traces of heavier elements.
Helium becomes a superfluid below 2.172 degrees Kelvin. It can flow through narrow gaps or capillaries without any viscous losses. It is frictionless.
The temperature of the cosmic microwave background is about 2.725 degrees Kelvin. This is very close to the superfluid temperature of Helium. Could the temperature be much lower in the interstellar voids, beyond the heliopause?
He-II might be immune to ram effects and still be subject to gravitational attraction. Could dark matter be superfliud helium (He-II)? In this case, dark matter is just an unusual phase of ordinary matter.