Freaked my wife out with [link|http://cicadamania.com/faq.html#a2|this little tidbit]:
Question: Do cicadas pee, and if so, why? (5/2002)
Short Answer: Because, like humans, they have to.
Answer: Courtesy of Les Daniels, author of the Great Lakes Cicada site:
"I've experienced this several times where I was on the receiving end of this artificial rain. When many cicadas congregate on warm days, they feed on the tree fluids and often urinate 'piss' while doing so. This bug urine is called 'honey dew.' The little buggers have pelted me several times while I was observing a little 'too' close. It isn't uncommon.
Lastly, the 'honey dew' does not stain, or stink. In fact, it feels like rain drops."