Every student pilot is taught about the left turning tendencies of an aircraft … well, almost every pilot, some Russian and Eastern European engines rotate in the other direction so they have some right turning tendencies.
One of the left turning forces is called spiraling slipstream. It’s the air pushed from the propeller and it spirals around the aircraft fuselage and hits the left side of the rudder.
It’s not usual that you can actually see the spiraling slipstream but today, an airplane was taking off and it was misting. The result is that you can see the persistence and the propeller path and thus the slipstream!