how can i make it look like water is falling from the ceiling without using water?
Having done Wedding Singer, I would say that if you absolutely can't use real water, the
effect might not be worth it. It's not a crucial
element to the story at all, and if the actress isn't genuinely soaking wet, you've kinda missed the
point of the
gag.
If you were going to do it without water, however, there are a couple ways you could make it work. I assume that you only want the water to fall tight on the actress, not across the entire
stage? Also, you'll probably want the falling water to only last a second or two, as the actress has to sing and dance a moment later. My first instinct would be to assault the actress with lots of light - ideally a whole bunch of tightly focused, obnoxiously bright arc sources pointing down at her - but that's probably not possible. If you can dedicate enough instruments and use a
bit of
haze, the brightness created by the lights in the air above her could evoke a feeling that something is falling down. How exactly this works would depend on how you chose to use colors, gobos, angles, and all that other "controllable properties of light" stuff.
I also really like Les's idea. Perhaps you can combine the two. If you can do something like he described but make it
drop at just the right time, when combined with top lighting and some rotating gobos, this could look really good. However, the problem is that you likely want the "water" to actually be falling *onto* someone, and dropping fishing
line (hell, dropping anything - but especially things that may need to be weighted down) onto someone is not a good idea.