Remote controlled flashlight?

I would like to be able to turn a flashlight on and off
with a
wireless remote from about 20' away (or so). I figured
if I get one of
those big plastic flashlights with the 6 volt battery
there should be
room for whatever electronics are needed, but I don't
know how to do
it.
I realize this sounds like a bit of a strange request,
but it's for a
theatrical production in which we'd like to be able to
turn a
flashlight on and off without anyone near it.
Any thoughts on either where I could find something like
this, or how
to make something? It has to be pretty simple for me to
able to do it
(limited electronics ability and knowledge).