The wind. We go with a friend from Norilsk (D) on the street:
I: Well the wind! Going is a little hindering.
D is figured. We in Norilsk, when we were preparing for the session, sat on the roof (well there is convenient, no one interferes). As a break, they decided to play football with a bottle of lemonade. After a strong pinch, the bottle flies beyond the roof, stops and returns, and you’re saying it’s going!