The end of the universe itself?

Unfortunately for your claim density is measured by mass/volume, so once again you need mass to create a black hole. In order to feel the force of a black hole you have to in fact be its pull, imagine a cone. At the point is where all the mass is concentrated (very dense ), unless you step into the area where the ice cream goes your not going to feel a thing (from the black hole that is).

1 gram in 0.0000000000000000000000000000000000000000001 cm.
That's more than a little dense.