Window Drops

What would you do with realistic, translucent and watery Window Drops? You could stick them on the bathroom mirror while someone is showering or maybe just on your neighbor's rear car window to see if he even notices. Who knows, but I'm sure there are plenty of uses for a little harmless liquid optical trickery. They come in a set of 8 with sizes varying from the largest at 5" x 2.5" to the smallest at 2".