vortex ring collision
http://youtu.be/XJk8ijAUCiI
Once generated two similar swirls with opposite angular speed, they increase the size of your radio to go forward. The speed with which approach becomes increasingly smaller, and increases the size of its radius faster. The radius will increase until both swirls disintegrate. If both are perfectly symmetrical eddies, the velocity of fluid elements parallel to the axis of symmetry in the middle between eddy and swirl is equal to zero. This line generated by all points where the velocity is zero, becomes a solid border where the speed through the wall is zero.
Smoke rings collide - If they did that in sci-fi movies, viewers would be all like, "Oh, come on, that's not even close to realistic!"
This is what physicists do when they're high.... :)
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