They're poor flyers with bad eyesight, and they're attracted to anything that sounds remotely like a mate. I remember they seemed to like the sound of the disc brakes on my Jackal approaching a stop. I wish I had a picture of the mob of cicadas hanging on me when I was running the lawnmower! They're also pretty slow, I remember seeing one flying right at be at an intersection in my car and I had enough time to roll up the window before it hit the glass and fell to the ground. They'll also get everywhere. My Wife even found them in her purse after bolting through a cloud of them from her car to the house. Mostly they're noisemakers, I actually kinda liked them.
And yes, they make a pretty good splat.