We made icecream the traditional way - with a tupperware filled with milk, sugar and vanilla inside a big tin filled with ice and salt. We began by sitting in the lift lobby and rolling it around, but got a bit tired of it and it also got rather cold on the surface of the tin. It got even cooler when ice crystals started forming on the top surface of the tin.
Then we took the whole thing downstairs and rolled it down the slide a couple of times. I think that the whole contraption required more ice though, for after ten minutes, almost all the ice had melted and we were left with very think milk shake. The girls drank it all up, so no loss. Guess we will make it again sometime with more ice