Imagine that your face has been famous for years or decades, and you never had any idea. This happens -- people have found out that completely without their knowledge, they've become icons.
Greetings, graduating classes of 2011! Congratulations on accomplishing all you have accomplished to get here, and pre-congratulations on all the accomplishments you will surely accomplish in your accomplishful futures.
There are plenty of weapon designs submitted every year. Thankfully, we have folks who make sure the ridiculous ones never see production. Sometimes, though, even they screw up.
Evolution has afforded every animal in the world the tools perfectly designed for its survival, whether it be claws, venom, horns, or whatever it is that cockroaches have. But every once in a while evolution makes a mistake and leaves a totally useless trait in an entire species. That's bad news for them, but good news for us, as it can be amusing