[William Terrell]

Aerodynamic drag causes water droplets to decelerate, transferring energy to the air and creating air currents akin to a tiny hurricane. Low pressure in the eye of that hurricane then tugs on the lower end of the shower curtain. Voila! It sucks in.

Possibly. I'd opt for a simplier explanation myself. The water rushing out of the shower head pushes the air down and under the shower curtain. Most people hang the curtain inside the tub to channel drippage. The air pushes the curtain in instead of sucks it in.

If that's true curtainsuck shouldn't be noticable with the curtain out side the tub. My curtain's too thick, but I notice a tiny bit of inward movement. When I hang it outside the tub I see none at all.

But, with a thick curtain, it's hard to tell. Maybe some out here with a thin nylon curtain would try it?

[Mike Darancette]

Maybe some out here with a thin nylon curtain would try it?

Preferably people with way too much free time on their hands . ;-)

[LostTribe]

I think the hot water coming out of the shower head quickly rises, creating a slight vacuum which pulls the shower curtain inward. (Would be interesting to try it with COLD water and see what happens...)