Q. What do you get if you cross a Bose-Einstein condensate and a liquid?

Something very amazing happens when 4He is cooled to 2.2 degrees...

"As we shall see, it is generally believed that the phenomenon of superfluidity is directly connected with the fact that the atoms of helium-4 obey Bose statistics, and the the lambda-transition is due to the onset of the peculiar phenomenon called Bose condensation." [Leggett (1989)]