This is an old video of two identical smoke rings colliding, or, in more scientific terms, “a head-on collision of colored vortex rings. Note the formation of small rings from the cross-linking of the wavy vortex filaments of the larger rings.” So basically this steamy video has it all: colored vortex rings, cross-linking, wavy vortex filaments — you name it. I swear, if this clip were any more erotic you’d have to rent it from the curtained section of a video store. PROTIP: wear a trench coat and fake mustache.

Keep going for the whole video. Also, what’s up with the video shake when they collide? Just how powerful was this?

Source: Geekologie – What Happens When Two Identical Smoke Rings Collide